13. If a, b, c be the sums of p, q, r terms respectively of an A.P. the value of (alp) (q - r) +(b/q) (r - p)+(c/r) (p-q) is(a) o(b) 1(c)-1(d) None

13. If a, b, c be the sums of p, q, r terms respectively of an A.P. th

1.	13. If a, b, c be the sums of p, q, r terms respectively of an A.P. the value of (alp) (q - r) +(b/q) (r - p)+(c/r) (p-q) is(a) o(b) 1(c)-1(d) None
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13. If a, b, c be the sums of p, q, r terms respectively of an A.P. the value of (alp) (q - r) +(b/q) (r - p)+(c/r) (p-q) is(a) o(b) 1(c)-1(d) None​

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13. If a, b, c be the sums of p, q, r terms respectively of an A.P. the value of (alp) (q - r) +(b/q) (r - p)+(c/r) (p-q) is(a) o(b) 1(c)-1(d) None