(c) If the sums of p. q and r terms of an A.P. are a, b and c respectively, prove that: a/p(q-r)+ b/q(r-p)+c/r(p-q)=0
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(c) If the sums of p. q and r terms of an A.P. are a, b and c respectively, prove that: a/p(q-r)+ b/q(r-p)+c/r(p-q)=0
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