the sum of the 5 th and 9 th term of an AP is 40 and sum of 8 th and 14 th term is 64 .Find the sum of first 20 terms
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the sum of the 5 th and 9 th term of an AP is 40 and sum of 8 th and 14 th term is 64 .Find the sum of first 20 terms
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