If the sum of the first 7 terms of an A.P. is 119 and that of the first 17 terms is 714, find the sum of its first 37 terms.
Also find the sum of 16th and 23rd terms of this AP.
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Given : If the sum of first 7 terms of an AP is 119 and that of the first 17 terms is 714. To find : The sum of its first n terms?
Missing: su | Must include:
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