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Summation by Sigma Method

In following ...

Question

In following question, a number series is given with one term missing. Choose correct alternative
1, 2, 3, 6, 9, 18, x , 54

A

18

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B

36

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C

81

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D

27

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Solution

The correct option is C 27
The numbers are alternatively multiplied by 2 and 3/2.
So, 1 $\times$ 2 = 2,
2 $\times$ 3/2 = 3,
3 $\times$ 2 = 6,
6 $\times$ 3/2 = 9,
so missing number = 18 $\times$ 3/2 = 27

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