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If r=1 in a G.P. then what is the sum to n terms?(a) n*a(b) a/n(c) (n-1) a(d) (n+1) aI had been asked this question in examination.Question is taken from Geometric Progression(G.P.) in section Sequences and Series of Mathematics – Class 11

Answer» RIGHT answer is (a) n*a

The best I can explain: If a is the FIRST term of G.P., then G.P. look like a, a, a, a, …………

Then sum to n TERMS BECOMES n*a.


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