\begin{array}{1 1}(A)\quad 720 & (B)\quad 120\\(C)\quad 0 & (D)\quad none\; of\; these\;\end{array}

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- 1. A mapping from A to B is one-one
- if $f(a)=f(b) \qquad a,b \in A$
- $=> a=b$
- 2.For every element $y \in B$ there exists an element $ x \in A$ such that $f(x)=y$
- 3.For a mapping to be both one-one and onto. the number of elements of A and B should be equal or a
- B subset of A

A has 5 elements

B has 6 elements

Since mumber of elements in B is more than A there cannot be any one-one and onto mapping from A to B

Solution:'c' option is correct

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