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Arithmetic Sequenceshard
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The sum of the first p,q,rp, q, rp,q,r terms of an arithmetic sequence are A,B,CA, B, CA,B,C respectively. Find the value of Ap(q−r)+Bq(r−p)+Cr(p−q)\frac{A}{p}(q-r) + \frac{B}{q}(r-p) + \frac{C}{r}(p-q)pA​(q−r)+qB​(r−p)+rC​(p−q).