1.Relation and Function
medium

જો $E = \{ 1,2,3,4\} $ અને $F = \{ 1,2\} $.તો $E$ થી $F$ પરના વ્યાપ્ત વિધેય ની સંખ્યા મેળવો.

A

$14$

B

$16$

C

$12$

D

$8$

(IIT-2001)

Solution

(a) The number of ways to give image to each element of $E$ in $F$ is $2$.
$\therefore$ The total number of ways to give images to the elements of $E$ in $F = 2 \times 2 \times 2 \times 2$.
But in two of them all the elements of $E$ have the same image $1$ or the same image $2$ (the mapping being into in these two cases).
$\therefore$ The number of onto functions $ = {2^4} – 2 = 14$.

Standard 12
Mathematics

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