let n(A)=4 and n(B)=6.then the number of one-one functions fromA to B is?do specify the explanation......

 Dear anjali

SInce no. of elements in A are 4 , for one-one functions only 4 elements from B can only be images of elements of A.

Now no. of one-one functions will be = no. of arrangements of 4 elements selected from B out of 6.

so answer is ⁶P₄.

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