If set A has 5 elements and set B has 7 elements than number of one-one and onto mapping from A to B is :
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 0
$n(A)=5,n(B)=7$
for mapping to be one one as well as onto
$n(A)=n(B)$
⇒ No mapping exist for this condition