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PreviousFind the greatest common divisor of 414 and 662 using the Euclidean algorithm.NextUse mathematical induction to prove this formula for the sum of a finite number of terms of a geometric progression with initial term a and common ratio r: \sum_{j=0}^{n} ar^j = a + ar + ar^2 + \dots + ar^n = \frac{ar^{n+1} - a}{r-1} when $r e 1 where n$ is a non-negative integer.
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