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Question

The common ratio of the geometric sequence an=3n1 is

A
1
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B
2
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C
3
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D
4
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Solution

The correct option is C 3
Given equation is an=3n1
Substitute n=1,2,3,4 in the given equation, we get
a1=30=1
a2=31=3
So, we get the first and second value of the G.P.
Common ratio = second numberfirst number
= 31=3
So, the common ratio is 3.

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