First slide
Arithmetic progression
Question

 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: 

Moderate
Solution

n2[2.8+(n1)4]=n2[2.17+(n1)2]n[8+2(n1)]=n(17+n1)2n2+6n=n2+16nn210n=0n=0  (impossible) n=10

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