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Question

 The sum of first n terms of an A.P. whose first term is 8 and the common difference is 20 is equal to the sum of first 2n terms of another A.P. whose first term is -30 and common difference is 8 . Find n. 


Solution

According to the question, we have
n228+n-120=2n22-30+2n-1816+20n-20=2-60+16n-820n-4=-136+32n12n=132n=11

Mathematics
RD Sharma (2016)
Standard X

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