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The ratio of 11th term to 18th term of a...

The ratio of 11th term to 18th term of an AP is 2:3. Find the ratio of 5th term to the 21st term, also the ratio of the sum of the first 5 terms to the sum of the first 21 terms.

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The correct Answer is:
From (2) and (3), `S_(5) : S_(21) = 30 : 294 = 5 : 49`.
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