If the set `A`contains 5 elements and the set B contains 6 elements, t – InterviewSolution

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1.	If the set `A`contains 5 elements and the set B contains 6 elements, then the numberof one-one and onto mappings from A to B is(a)720(b) 120(c) 0 (d) none of these
Answer» As there are `5` elements in set `A` and `6` elements in set `B`, if we try to make a one -one function from `A` to `B`, one element of `B` is not used. So, function will not be onto. If we try to make an onto function, then at least one of the elements of `A` should have more than one mapping to set `B`. In this case, it will not be a one-one function. So, we can not create a function that is both onto and one-one with the given sets. So, option `(c)` is the correct option.

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