Question

If n(A)=n(B),then f is bijection from A to B​

Answer 1

Answer:

A bijection from A to B is a function which maps every element of A to unique element of B i.e. injective.

⟹n(B)≥n(A)

Also, it ensures that every element of B is an image of some element of A

i

is a bijection.

Any and all images of some fixed a

i

Hence, the number of functions is exactly equal to the number of such permutations, which

Correct option is {m/2}!