Question

N(A)=3 n(B)=4 number of surjection from A to B is​

Answer 1

Step-by-step explanation:

Each element in A can be mapped onto any of two elements of B

∴ Total possible functions are 2n

For the fn′s to be surjections , they shouldn't be mapped alone to any of the two elements.

∴ Total no of surjections =2n−2

2n−2=62

⇒n=6