Add: p(p-q), q(q-r) and r (r-p) – InterviewSolution

1.	Add: p(p-q), q(q-r) and r (r-p)
Answer» p(p-q) + q(q-r) + r(r-p)p²-pq + q² -qr+ r² -rpp²+q²+r² - pq-qr-rp

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