Bernie and banks

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Problem description. Bernie Sanders says if elected he will break up the big banks so as to stabilize the economy. For that he wants to know the number of unordered pairs of integers from 1 to N which are coprime To find that out he needs your help . So given an integer N find the answer Input Input description. The first line contains T denoting the number of test cases. The corresponding

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solution.cppC++17

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