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Question

What is the sum of G.P. 1+p+p2+p3+p4+p5,(p<1)?

A
S6=1p61p
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B
S5=1p51p
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C
S4=1p41p
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D
S6=1p61+p
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Solution

The correct option is A S6=1p61p
Given sequence is 1+p+p2+p3+p4+p5
To find the sum of the first Sn terms of a geometric sequence using the formula
Here a=1,r=p,n=6
We know Sn=a1(1rn)1r

S6=1(1(p)6)1p

S6=1p61p

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