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15. Ilow many terms of the G.P. 33069ate needed to give the sus512h the midunoi nf the line segment

Answer»

a = 3

r = 1/2

Sum of n terms in a GP =

a(1-r^n)/(1-r)

So

3069/512 = 3(1-(1/2)^n)/(1-1/2)

3069/512*3*2 = 1- (1/2)^n

3069/3072 = 1- (1/2)^n

(1/2)^n = 1- 3069/3072

(1/2)^n = 3/3072

(1/2)^n = 1/1024

(1/2)^n = (1/2)^10

Solving this equation we get the value of n = 10

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