(A) 720

(B) 120

(C) 30

(D) 0

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- Bijection mapping means $1-1$ and $onto$

For onto function set B should be Range

For 1-1 function distinct elements in A should be related with distinct elements in B

There are 5 elements in A .

These 5 elements can be related with 5 distinct elements in set B

But there are 6 elements in B. Therefore one element will be left unrelated.

Hence we cannot have onto function from A to B

The answer is $0$.

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