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Summation by Sigma Method

Find the miss...

Question

Find the missing number in the following series?
3, 5, 5, 19, 7, 41, 9, ?

A

71

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B

61

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C

79

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D

69

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Solution

The correct option is A 71
Fiest series : 3, 5, 7, 9
Second series : 5, 19, 41, ?
Difference of Second series are 14, 22, 30 etc
Next term is 41+30 i.e equal to 71

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