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Questions  

 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 n0 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

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detailed solution

Correct option is B

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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If the sum of first n terms of an AP is cn2, then the sum of squares of these  n terms is 


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