The sum of first P, Q, R terms of an AP are a,b,c. Show that a/p(q-r)+b/q(r-p)+c/r(p-q)=0.

The sum of first P, Q, R terms of an AP are a,b,c. Show that a/p(q-r)+

1.	The sum of first P, Q, R terms of an AP are a,b,c. Show that a/p(q-r)+b/q(r-p)+c/r(p-q)=0.
Answer» This question is not from class 11 .It is from class 10 . The following solution is here : a=sum of p term a=p/2{2A+(p-1)D}2a/p={2A+(p-1)D}.........…..…...........….(1)b=sum of q termb=q/2{2A (q-1)D}2b/q={2A+(q-1)D}.…..........................(2)& c = ,sum of r term2c/r={2A +(r-1)D } ...….....…............(3)Multiplying (1) ,(2) &(3) by ,(q - r),(r - p) ,(p -q) &add , we get2a/p(q-r)+2b/q(r-p)+2c/r(p-q) 2A×0+D×0=0 Chapter = 9....sequence and series..... Question no. 11 This question is from class 11..........chapter 9 ....ex = 9.2...........so i can not do it...