1. In a geometric series with first term, a and common ratio, r (where r is real and r#1), the

1. In a geometric series with first term, a and common ratio, r (where r is real and r#1), the sum of the first 7 terms is 4 times the sum of the following 7 terms. Find the ratio of the sum of the first 21 terms to the sum of the first 14 terms.​


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