Lesson :Arthematic
Progression
Class:10
1. Find the sum of 1st 15terms of the AP 102, 107, 112,............997
plz no irrelevant answers
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Step-by-step explanation:
sum of first 15 terms= 15/2 +(2×102+ (15-1)×5)
= 15/2(204 + 70)
= 15/2(274)
= 15× 137
= 2055
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