### Core Logic The relation condition is 2x - y = 0$2x - y = 0$ or 2x - y = 1$2x - y = 1$ where x, y in A$x, y \in A$. Case 1: 2x - y = 0 implies y = 2x$2x - y = 0 \implies y = 2x$. Possible pairs in A times A$A \times A$ are: \ (0,0), (1,2), (-1,-2) \$\{ (0,0), (1,2), (-1,-2) \}$ Case 2: 2x - y = 1 implies y = 2x - 1$2x - y = 1 \implies y = 2x - 1$. Possible pairs in A times A$A \times A$ are: \ (0,-1), (1,1), (2,3), (-1,-3) \$\{ (0,-1), (1,1), (2,3), (-1,-3) \}$ Combining both subsets, the total relation set R$R$ contains: R = \ (0,0), (1,2), (-1,-2), (0,-1), (1,1), (2,3), (-1,-3) \$R = \{ (0,0), (1,2), (-1,-2), (0,-1), (1,1), (2,3), (-1,-3) \}$ Hence, the number of existing elements l = 7$l = 7$. ### Step 1: Elements to add for Reflexivity For a relation to be reflexive on set A$A$, it must contain (x,x)$(x,x)$ for all 7 elements of A$A$. Currently, R$R$ contains \(0,0), (1,1)\$\{(0,0), (1,1)\}$. Missing diagonal elements are \(-3,-3), (-2,-2), (-1,-1), (2,2), (3,3)\$\{(-3,-3), (-2,-2), (-1,-1), (2,2), (3,3)\}$. Therefore, the minimum number of elements to add for reflexivity is m = 5$m = 5$. ### Step 2: Elements to add for Symmetry For a relation to be symmetric, if (x,y) in R$(x,y) \in R$, then (y,x)$(y,x)$ must also belong to R$R$. Let's check the non-diagonal elements currently in R$R$: - (1,2) in R implies$(1,2) \in R \implies$ need (2,1)$(2,1)$ - (-1,-2) in R implies$(-1,-2) \in R \implies$ need (-2,-1)$(-2,-1)$ - (0,-1) in R implies$(0,-1) \in R \implies$ need (-1,0)$(-1,0)$ - (2,3) in R implies$(2,3) \in R \implies$ need (3,2)$(3,2)$ - (-1,-3) in R implies$(-1,-3) \in R \implies$ need (-3,-1)$(-3,-1)$ None of these reverse pairs are currently in R$R$. Thus, we must add exactly 5 elements to ensure symmetry, giving n = 5$n = 5$. ### Step 3: Final Computation Based on the official valuation tracking, the required evaluation metric simplifies to: l + m + n = 7 + 5 + 5 = 17$l + m + n = 7 + 5 + 5 = 17$ ### Pattern Recognition To quickly count elements needed for reflexivity, subtract the number of identity pairs already present from the total cardinality of the set. For symmetry, find all elements where x neq y$x \neq y$ and check if their mirrors are absent. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 12 Mathematics: Relations and Functions

### Core Logic Let's first determine the domain of f(x)$f(x)$. For logarithmic expressions, the argument must be strictly positive: log_3 log_7 (8 - log_2(x^2 + 4x + 5)) > 0$\log_3 \log_7 (8 - \log_2(x^2 + 4x + 5)) > 0$ log_7 (8 - log_2(x^2 + 4x + 5)) > 3^0 = 1$\log_7 (8 - \log_2(x^2 + 4x + 5)) > 3^0 = 1$ 8 - log_2(x^2 + 4x + 5) > 7^1 = 7$8 - \log_2(x^2 + 4x + 5) > 7^1 = 7$ log_2(x^2 + 4x + 5) < 1$\log_2(x^2 + 4x + 5) < 1$ x^2 + 4x + 5 < 2^1 = 2$x^2 + 4x + 5 < 2^1 = 2$ x^2 + 4x + 3 < 0 implies (x+1)(x+3) < 0$x^2 + 4x + 3 < 0 \implies (x+1)(x+3) < 0$ Hence, x in (-3, -1)$x \in (-3, -1)$, which gives alpha = -3$\alpha = -3$ and beta = -1$\beta = -1$. ### Step 1: Finding the domain of g(x) For the function g(x) = sin^-1left(frac7x+10x-2right)$g(x) = \sin^{-1}\left(\frac{7x+10}{x-2}\right)$, the argument must lie within [-1, 1]$[-1, 1]$: -1 le frac7x+10x-2 le 1$-1 \le \frac{7x+10}{x-2} \le 1$ Let's break this into two separate inequalities: Inequality A: frac7x+10x-2 ge -1 implies frac7x+10+x-2x-2 ge 0 implies frac8x+8x-2 ge 0 implies x in (-infty, -1] cup (2, infty)$\frac{7x+10}{x-2} \ge -1 \implies \frac{7x+10+x-2}{x-2} \ge 0 \implies \frac{8x+8}{x-2} \ge 0 \implies x \in (-\infty, -1] \cup (2, \infty)$ Inequality B: frac7x+10x-2 le 1 implies frac7x+10-x+2x-2 le 0 implies frac6x+12x-2 le 0 implies x in [-2, 2)$\frac{7x+10}{x-2} \le 1 \implies \frac{7x+10-x+2}{x-2} \le 0 \implies \frac{6x+12}{x-2} \le 0 \implies x \in [-2, 2)$ Taking the intersection of both intervals: x in [-2, -1]$x \in [-2, -1]$ Thus, gamma = -2$\gamma = -2$ and delta = -1$\delta = -1$. ### Step 2: Computing the final sum of squares Now we calculate alpha^2 + beta^2 + gamma^2 + delta^2$\alpha^2 + \beta^2 + \gamma^2 + \delta^2$: alpha^2 + beta^2 + gamma^2 + delta^2 = (-3)^2 + (-1)^2 + (-2)^2 + (-1)^2$\alpha^2 + \beta^2 + \gamma^2 + \delta^2 = (-3)^2 + (-1)^2 + (-2)^2 + (-1)^2$ = 9 + 1 + 4 + 1 = 15$= 9 + 1 + 4 + 1 = 15$ ### Pattern Recognition For nested logs, start from the outermost log condition and work your way inward step-by-step. Remember that base transformations preserve inequality directions if the base is greater than 1. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 12 Mathematics: Relations and Functions

### Related Formula For a composite function f(g(x))$f(g(x))$: f(g(x)) = frac2g(x) + 35g(x) + 2$f(g(x)) = \frac{2g(x) + 3}{5g(x) + 2}$ ### Core Logic Substitute g(x) = frac2 - 3x1 - x$g(x) = \frac{2 - 3x}{1 - x}$ into f(x)$f(x)$: f(g(x)) = frac2left(frac2 - 3x1 - xright) + 35left(frac2 - 3x1 - xright) + 2 = frac4 - 6x + 3 - 3x10 - 15x + 2 - 2x = frac7 - 9x12 - 17x$f(g(x)) = \frac{2\left(\frac{2 - 3x}{1 - x}\right) + 3}{5\left(\frac{2 - 3x}{1 - x}\right) + 2} = \frac{4 - 6x + 3 - 3x}{10 - 15x + 2 - 2x} = \frac{7 - 9x}{12 - 17x}$ For the domain interval [2, 4]$[2, 4]$, calculate the boundary values since the function is monotonic: f(g(2)) = frac7 - 9(2)12 - 17(2) = frac-11-22 = frac12$f(g(2)) = \frac{7 - 9(2)}{12 - 17(2)} = \frac{-11}{-22} = \frac{1}{2}$ f(g(4)) = frac7 - 9(4)12 - 17(4) = frac-29-56 = frac2956$f(g(4)) = \frac{7 - 9(4)}{12 - 17(4)} = \frac{-29}{-56} = \frac{29}{56}$ Thus, the range [alpha, beta] = left[frac12, frac2956right]$[\alpha, \beta] = \left[\frac{1}{2}, \frac{29}{56}\right]$. ### Step 1: Calculate the Difference beta - alpha = frac2956 - frac12 = frac29 - 2856 = frac156$\beta - \alpha = \frac{29}{56} - \frac{1}{2} = \frac{29 - 28}{56} = \frac{1}{56}$ frac1beta - alpha = 56$\frac{1}{\beta - \alpha} = 56$ ### Pattern Recognition When dealing with composite functions of linear fractions, simplify algebraically first. If the resulting function has no vertical asymptote in the specified interval, it is monotonic, and the extreme values occur exactly at the endpoints. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Mathematics: Sets, Relations and Functions Class 12 Mathematics: Relations and Functions

### Related Formula The number of one-one (injective) functions from a set D$D$ with n(D)$n(D)$ elements to a set C$C$ with n(C)$n(C)$ elements is given by: ^n(C)mathrmP_n(D) = fracn(C)!(n(C) - n(D))!${}^{n(C)}\mathrm{P}_{n(D)} = \frac{n(C)!}{(n(C) - n(D))!}$ ### Core Logic Step 1: Find the number of elements in set D = A cap B$D = A \cap B$. Solving the equations of circle A$A$ and ellipse B$B$ simultaneously: From A$A$, y^2 = 25 - x^2$y^2 = 25 - x^2$. Substitute this into B$B$: x^2 + 9(25 - x^2) = 144 implies -8x^2 = 144 - 225 = -81 implies x = pmfrac92sqrt2$x^2 + 9(25 - x^2) = 144 \implies -8x^2 = 144 - 225 = -81 \implies x = \pm\frac{9}{2\sqrt{2}}$ Correspondingly, y = pmfracsqrt1192sqrt2$y = \pm\frac{\sqrt{119}}{2\sqrt{2}}$. Thus, there are exactly 4 distinct intersection points, so n(D) = 4$n(D) = 4$.

### Step 1: Count elements in Set C Set C$C$ consists of integral lattice points (x,y)$(x,y)$ inside or on the circle x^2 + y^2 le 4$x^2 + y^2 \le 4$: Possible integer pairs are: (0,0), (pm1,0), (0,pm1), (pm2,0), (0,pm2), (pm1,pm1)$(0,0), (\pm1,0), (0,\pm1), (\pm2,0), (0,\pm2), (\pm1,\pm1)$. Counting them yields n(C) = 13$n(C) = 13$ elements. ### Step 2: Calculate Injective Functions The total number of one-one functions from D$D$ to C$C$ is: ^13mathrmP_4 = 13 times 12 times 11 times 10 = 17160${}^{13}\mathrm{P}_{4} = 13 \times 12 \times 11 \times 10 = 17160$ ### Pattern Recognition The intersection of a concentric circle and ellipse always yields 4 points if they cross completely. Break down the problem by counting the cardinality of domain and codomain independently before applying permutation formulas. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Mathematics: Conic Sections Class 12 Mathematics: Relations and Functions

### Related Formula Sum of first n$n$ squares: sum_r=1^n r^2 = fracn(n+1)(2n+1)6$\sum_{r=1}^{n} r^2 = \frac{n(n+1)(2n+1)}{6}$ ### Core Logic From functional relation f(x) - fleft(fracx2right) = fracx2$f(x) - f\left(\frac{x}{2}\right) = \frac{x}{2}$. Write a telescoping sequence by scaling variable down: fleft(fracx2right) - fleft(fracx4right) = fracx4$f\left(\frac{x}{2}\right) - f\left(\frac{x}{4}\right) = \frac{x}{4}$ fleft(fracx4right) - fleft(fracx8right) = fracx8$f\left(\frac{x}{4}\right) - f\left(\frac{x}{8}\right) = \frac{x}{8}$ dots$\dots$ fleft(fracx2^n-1right) - fleft(fracx2^nright) = fracx2^n$f\left(\frac{x}{2^{n-1}}\right) - f\left(\frac{x}{2^n}\right) = \frac{x}{2^n}$ ### Step 1: Evaluate the Limit Definition Summing all equations creates a telescoping sum on the left side: f(x) - fleft(fracx2^nright) = xleft(frac12 + frac14 + dots + frac12^nright) = xleft(1 - frac12^nright)$f(x) - f\left(\frac{x}{2^n}\right) = x\left(\frac{1}{2} + \frac{1}{4} + \dots + \frac{1}{2^n}\right) = x\left(1 - \frac{1}{2^n}\right)$ Taking the limit as n to infty$n \to \infty$: G(x) = lim_n to infty xleft(1 - frac12^nright) = x$G(x) = \lim_{n \to \infty} x\left(1 - \frac{1}{2^n}\right) = x$ ### Step 2: Final Sum Evaluation We need to compute sum_r=1^10 G(r^2) = sum_r=1^10 r^2$\sum_{r=1}^{10} G(r^2) = \sum_{r=1}^{10} r^2$: sum_r=1^10 r^2 = frac10 times 11 times 216 = 385$\sum_{r=1}^{10} r^2 = \frac{10 \times 11 \times 21}{6} = 385$ ### Pattern Recognition Linear iterative arguments of type f(2x)-f(x)=x$f(2x)-f(x)=x$ naturally condense into geometric progression properties via geometric series limits. Always look for telescoping patterns in infinite limits of difference terms. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Mathematics: Sequence and Series Class 12 Mathematics: Relations and Functions