Question

Factorise : (p – q)3 + (q – r)3 + (r – p)3
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Answer 1

$\tt{(p - q)3 + (q - r)3 + (r - p)3} \\ \tt{3((p - q) + (q - r) + (r - p))} \\ \tt{3(p - q + q - r + r - p)} \\ 3(0) \\ 0$

Hope my answer will help you