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The number of one one functions that can be defined from A=1,2,3,4,5 into B=a,b,c,d is

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a
120
b
24
c
20
d
0

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detailed solution

Correct option is D

The number of one one function from the set A to the set B is nBPnA if n(B) n(A)

and 0 if n(B)<n(A)

Given A=1,2,3,4,5 and B=a,b,c,d

Here nA=5,nB=4

Here the number of elements in the codomain set is less than the number of elements of the domain set

Therefore, the number one one funcitons from the set A to the set B is zero. 

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