16. The 3
rd term of an AP is 8 and the 9
th term of the AP exceeds three times
the 3
rd term by 2. Find the sum of its first 21 terms
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16. The 3
rd term of an AP is 8 and the 9
th term of the AP exceeds three times
the 3
rd term by 2. Find the sum of its first 21 terms
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