1.Relation and Function
medium

ધારેકે $A =\{2,3,4\}$ અને $B =\{8,9,12\}$. તો સંબંધ $R =\left\{\left(\left( a _1, b _1\right),\left( a _2, b _2\right)\right) \in( A \times B , A \times B ): a_1\right.$ એ $b_2$ ને ભાગે છે તથા $a_2$ એ $b_1$ ને ભાગે છે માં ધટકો ની સંખ્યા $........$ છે.

A

$36$

B

$12$

C

$18$

D

$24$

(JEE MAIN-2023)

Solution

$a_1$ divides $b_2$

Each element has 2 choices

$\Rightarrow 3 \times 2=6$

$a_2$ divides $b_1$

Each element has $2$ choices

$\Rightarrow 3 \times 2=6$

$\text { Total }=6 \times 6=36$

Standard 12
Mathematics

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