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Q.

Let S1 be the sum of the first n terms of the A.P. 8,12,16………… and let S2 be the sum of the first n terms of the A.P 17,19,21…………, assume n≠0,  then S1=S2 for:

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a

no value of n

b

one value of n

c

two values of n

d

more than 2 values of n

answer is B.

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Detailed Solution

n2[2.8+(n−1)4]=n2[2.17+(n−1)2]n[8+2(n−1)]=n(17+n−1)2n2+6n=n2+16nn2−10n=0n=0  (impossible) n=10
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