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<!--info-header-start--><h1>Triangular number </h1><blockquote><p>by null <a href="https://github.com/aswinsvijay" target="_blank">@aswinsvijay</a></p></blockquote><p><a href="https://tsch.js.org/27152/play" target="_blank"></a> </p><!--info-header-end-->

Given a number N, find the Nth triangular number, i.e. 1 + 2 + 3 + ... + N

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