Let x denote the total number of one-one functions from a set A with 3 elements to a set B with 5 elements and y denote the total number of one-one functions from the set A to the set A B. Then :
Option: 1 y = 273x
Option: 2 2y = 91x
Option: 3 y = 91x
Option: 4 2y = 273x
x = number of one one function from A → B
Number of the element in A × B is 3 × 5 = 15
y = number of one one function from A → A × B
Therefore, 2y = 91x
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