Find the sum of a-b/a+b + 3a-2b/a+b + 5a-3b/a+b + ......upto 11 terms.
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a-b/a+b + 3a-2b/a+b + 5a-3b/a+b........up to 11 terms these are in A.P
last term=a+(n-1)d=a-b/a+b +(11-1)(2a-b/a+b)=21a-11b/a+b
sum of terms=11/2[21a-11b/a+b]
last term=a+(n-1)d=a-b/a+b +(11-1)(2a-b/a+b)=21a-11b/a+b
sum of terms=11/2[21a-11b/a+b]
king0987:
thanx
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