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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, ?, 5, 10, 20, 40, 80

A

1

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B

2

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C

2.5

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D

4

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E

None of these

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Solution

The correct option is C 4
Next number is sum of all previous numbers.
1st Term : 1
2nd Term: 4
3rd Term: 1+4 =5
4th Term: 1+4+5= 10
5th Term: 1+4+5+10=20 and so on....

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