4.
Statement (A): The function which is not an onto is called many to one.
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Statement (B): If n(A) = 6, then the number of bijective functions from set 'A' to itself is 720.
a) Both A and B are true
b) Both A and B are false
c) A is true and B is false
d) A is false and B is true
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Explanation: From a set of m elements to a set of 2 elements, the total number of functions is 2m. Out of these functions, 2 functions are not onto (If all elements are mapped to 1st element of Y or all elements are mapped to 2nd element of Y). So, number of onto functions is 2m-2.
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