The ratio of the 11th term to the 18th term of an AP is 2:3. Find the ratio of the 5th term ti 21st term and also the ratio of the first 5 terms to the sum of first 21st terms.
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Step-by-step explanation:the ratio of the 5th term to 21st term is 1/3and sum of its ratio is 1/22.35
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