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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.

Posted by Chaitanya Chaitanya 6 years, 11 months ago

CBSE > Class 10 > Mathematics

3 answers

Nitya Mishra 6 years, 11 months ago

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 term b=q/2{2A (q-1)D} 2b/q={2A+(q-1)D}.…..........................(2) & c = ,sum of r term 2c/r={2A +(r-1)D } ...….....…............(3) Multiplying (1) ,(2) &(3) by ,(q - r),(r - p) ,(p -q) &add , we get 2a/p(q-r)+2b/q(r-p)+2c/r(p-q) 2A×0+D×0=0

3Thank You

Gurjar Kabir (बैंसला) 6 years, 11 months ago

Chapter = 9....sequence and series..... Question no. 11

1Thank You

Gurjar Kabir (बैंसला) 6 years, 11 months ago

This question is from class 11..........chapter 9 ....ex = 9.2...........so i can not do it...

1Thank You

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Posted by Kanika . 1 month ago

CBSE > Class 10 > Mathematics

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If 1/2 is a root of equation x^2+kx- 5/4 =0 , then what is the value of k

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CBSE > Class 10 > Mathematics

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CBSE > Class 10 > Mathematics