let A be the set of all strings of decimal digits of length ﬁve. For example, 00312 and 19483
are strings in A.
-How many strings in A have exactly three 5s?

Name: let A be the set of all strings of decimal digits of length ﬁve. For example, 00312 and 19483 are strings in A. -How many strings in A have exactly three 5s?
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The Answer of let A be the set of all strings of decimal digits of length ﬁve. For example, 00312 and 19483
are strings in A.
-How many strings in A have exactly three 5s?

Let a Be the Set of All Strings of Decimal