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What will be next number in this series. 2, 5, 9, 19, 37,__

Interview question and answer by: Virendradugar | Posted on: 12/18/2009 | Category: Aptitude Test Interview questions | Views: 13782 |
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Select from following answers:
  1. 64
  2. 55
  3. 75
  4. 46

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 Responses
Posted by: Selankumaran | Posted on: 19 Dec 2009 12:56:52 AM | Alert Moderator 

Hi,

I feel the answer should be 75 not 73.

As the series is +1 and -1 in alternate

2*2 = 4 + 1 (5)
5*2=10-1 (9)
9*2=18+1 (19)
19*2=38-1 (37)
37*2=74-1 (73)

The last should be 37*2=74+1 (75).

Thanks,
Elan
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