Find The Term

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You are given a sequence of numbers 1,3,6,10... . Here first number of sequence is 1, second number is 3, third number is 6, forth number is 10, and so on. You will be given an integer $N$. Determine the $N$-th term of this sequence. ###Input: - First line will contain $T$, number of testcases. Then the testcases follow. - Each testcase contains of a single line of input, one integer $

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solution.cppC++17

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