Even Odd

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Ravi is very good student in mathematics and he also like Even numbers very much . On the other hand his friend Jhon like Odd numbers . Both of them are preparing for IIT JEE Advance .One day they are solving a question together the question was Find the sum of first $n$ terms of the given series $1^2+2.2^2+3^2+2.4^2+5^2+2.6^2+...........$ If the sum is odd then Jhon will be happy and wil

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solution.cppC++17

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