Sum of AP

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Write a program to find out the sum of an A.P. series. For e.g. if 1,5,9,13,17,21 are in A.P. series then sum of A.P is 1+5+9+13+17+21= 66. ### Input - First line will contain $T$, number of testcases. Then the testcases follow. - Each testcase contains three input separated by space, i.e. $A$ starting number of series , $N$ number of items for the A.P. series and $D$ common difference . ###

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solution.cppC++17

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