The first term of an arithmetic progression is –5 and the fifth term is 7. What is the sum of the first 40 terms of this progression? - Quora
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Which formula(s) can be used to find the nth partial sum of an arithmetic sequence or the sum of the first - brainly.com
The sum of the first 2 terms of an arithmetic progression is 50 and the sum of the next 20 terms is -50. What is the sum of the first 100 terms? - Quora
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sum of first n terms of arithmetic series is Sn=bn-2n^2. if 10th term is -16, find b?| MechGate - YouTube
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