Total Triplets

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Chef taught Shobhit about AP series. Yes, the very old one: a, a+d, a+2d, a+3d….and so on. Now to test his understanding on AP and combinatorics (art of counting) chef has given shobhit a task to find out total number of triplets which form an AP in the first n natural numbers staring from 1 all the way up to n. Since shobhit is scared by the complexity of the problem, he asks for your help in the

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solution.cppC++17

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