pl amswer this quetsin

The number of one-one functions that can be defined from A = {4, 8, 12, 16} to B is 5040, then n(B)
1) 7
2) 8
3) 9
4) 10

Dear student, here is an answer for your query. 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 Regards!

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