solve the followed question:

Asked by  | 6th Jul, 2008, 11:47: PM

Expert Answer:

the sum of infinite G.P. whose first term is a and geometric ratio is r , is equal to S = a / (1-r)

so Sp = 1/ (1-rp)       and      sp = 1/ (1+rp

Sp+ sp =  1/ (1-rp)  +  1/ (1+rp)  = 2 / (1-r2p)  = 2S2p

Answered by  | 12th Sep, 2008, 11:59: PM

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