series of even

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Series of even natural number is given . 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 ..... 10^9 you have to find a missing number if sum of first N number is given for example : N=5, Sum=24 you have to find missing term in first 5 number according to above series sum of first 5 number is 30, and if we subtract 6 from it then sum becomes 24 hence the missing number is 6 . ### Input:

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solution.cppC++17

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