Question: How many three - digit numbers contain the digits 4 and 6 but none of the digits 2 , 5 , or 8 ? How

How many three-digit numbers contain the digits 4 and 6 but none of
the digits 2,5, or 8?
How many permutations of the letters a, b, c, d, e, f , g have either two
or three letters between a and b?

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