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Question

Find the seventh term of the geometric sequence 1,3,9,27,....

A
-243
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B
-30
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C
81
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D
189
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E
729
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Solution

The correct option is E 729
nth term of geometric sequence =an=a1×(r)n1
Where a1 = first term ,r= common ratio,n=nth term
Here a1=1.r=31=3,n=7th term
a7=1×(3)71
a7=1×(3)6
a7=729

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