Can u please help me I’m stuck on this .

Find the value of 1715⋅211.though these numbers aren't quite as nice as the ones from the example or the previous part, the procedure is the same, so this is really no more difficult. give the numerator followed by the denominator, separated by a comma.

What ia the sum if the first 7 terms of the geometric series

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?