If f: x y , where x= a, b, c, d & y= A, B, C, D , then the number of possible invertible function such that in mapping at least one element of set x is mapped with same alphabet in y are -

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Correct answer: B. 15

Ans. (B) Total - (Dearrangement) 4! - (Dearrangement of 4 objects) 24-9=15

If f: x y , where x= a, b, c, d & y= A, B, C, D , then the number of possible invertible function such that in mapping at least one element of set x is mapped with same alphabet in y are -

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