Digit integers

Let U denote the set of all 5 digit integers. (Note 01466 is not a 5 digit integer)a) Find n(U) answer= 90,000b) Let A be the set of integers in U that have 5 distinct digits. The integers 24357 is an example of an element of A. Find n(A) answer= 27,216c) Let B be the set of integers in U that only have odd digits. Find (B). answer= 3125Please help I have never seen this type of question before.

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