Question

if n(A)=7,b(B)=10 then no. of one one functions from A to B is​

Answer 1

Answer:

n(A) =7 n(B)=10

Step-by-step explanation:

A +B = 7 .10 =70

Answer 2

the first element 4 of A can be mapped to any of the n elements in B

Similarly second element 8 of A can be mapped to any of (n−1) elements in B

⇒ Total no of one - one functions is

n(n−1)(n−2)(n−3)=5040

⇒n=10