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Find pair of n numbers in php

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Recently I was working on mobile project in which we were working on service code in php, To find the pair in certain number in list.  Example:  $total = 4; $pair_total = $total * ($total - 1) * 0.5; // 6 So here we are able to find the pair combination using this formula.And pls comment if there any tricks similar to this.
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php: nested if in select tag

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