Let S = {1, 2, 3, 4, 5, 6} and X be the set o | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) First,we determine the number of pairs $(a, b)$ such that $a, b \in S$ and $|a-b| \geq 2$.For each $a \in S$,the number of possible $b$ values is:

Vedclass · Accepted Answer

$20, 36$

Vedclass · Answer

(A) First,we determine the number of pairs $(a, b)$ such that $a, b \in S$ and $|a-b| \geq 2$.For each $a \in S$,the number of possible $b$ values is:- If $a=1$,$b \in \{3, 4, 5, 6\}$ ($4$ values)- If $a=2$,$b \in \{4, 5, 6\}$ ($3$ values)- If $a=3$,$b \in \{1, 5, 6\}$ ($3$ values)- If $a=4$,$b \in \{1, 2, 6\}$ ($3$ values)- If $a=5$,$b \in \{1, 2, 3\}$ ($3$ values)- If $a=6$,$b \in \{1, 2, 3, 4\}$ ($4$ values)Total number of such pairs is $4+3+3+3+3+4 = 20$.Since $R$ must have exactly $6$ elements chosen from these $20$ pairs,$n(X) = {}^{20}C_{6}$,so $m = 20$.For $n(Y)$,the range of $R$ has exactly one element,meaning all $6$ pairs $(a, b)$ in $R$ must have the same $b$. However,for any fixed $b$,there are at most $5$ values of $a$ such that $|a-b| \geq 2$. Thus,$n(Y) = 0$.For $n(Z)$,$R$ is a function,meaning for each $a \in S$,there is exactly one $b$ such that $(a, b) \in R$ and $|a-b| \geq 2$. The number of choices for each $a$ is $4, 3, 3, 3, 3, 4$ respectively. Thus,$n(Z) = 4 	imes 3 	imes 3 	imes 3 	imes 3 	imes 4 = 1296 = 36^{2}$.Therefore,$n(Y) + n(Z) = 0 + 36^{2} = 36^{2}$,so $|k| = 36$.

Similar Questions

If $f(x) = \sqrt{x^2 + x} + \frac{\tan^2 \alpha}{\sqrt{x^2 + x}}$,where $\alpha \in (0, \pi/2)$ and $x > 0$,then the value of $f(x)$ is greater than or equal to:

The number of roots of the equation $\sqrt{2}+e^{\cosh^{-1} x}-e^{\sinh^{-1} x}=0$ is

If $f(x)=3[x]+\{x+1\}$,where $[x]$ is the greatest integer function of $x$ and $\{x\}$ is the fractional part function of $x$,then $f(-1.32)=$

Which one of the following best represents the graph of the function $f(x) = \lim_{n \to \infty} \frac{2}{\pi} \tan^{-1}(nx)$?

Vedclass Test Series

Exam Paper Generator

Online Exam Module