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Question

Find the indicated sums for the following Geometric Progression.
1,2,2,.......... Find S10

A
31(21)
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B
31(2+1)
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C
32(2+1)
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D
32(21)
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Solution

The correct option is B 31(2+1)
Clearly, the given GP has first term a=1 and common ratio r=2.
S10=a×(r101r1)=1×((2)10121)
=3121×2+12+1
=31×(2+1)21
=31(2+1)

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