Brain teaser # 7

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Sr. Executive - Finance & Accounts
1732 Points Joined February 2011

Find the Next Number in the series!

 

1, 3, 7, 15, 31, 63, 127, _____ 

Give explanation to your answers!

Cheers!!!!!

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On 19 June 2012 at 10:11 Report
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The Easy are never Good and the Good are
4957 Points Joined January 2012

Answer is 255......

Explanation:

1x2 + 1 = 3

3x2 + 1 = 7

7x2 + 1 = 15

.

.

127x2 + 1 = 255.......smiley

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On 19 June 2012 at 10:32
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255

series difference between next term  
1    
3 2 gets double
7 4 gets double
15 8 gets double
31 16 gets double
63 32 gets double
127 64 gets double
255 128 gets double

 

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On 19 June 2012 at 11:04
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Asst. Finance Manager
195 Points Joined June 2010

255

series differences get doubled in every step.

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On 19 June 2012 at 12:51
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Sr. Executive - Finance & Accounts
1732 Points Joined February 2011

Hey Guys....You all got it correct !!

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On 20 June 2012 at 10:01

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