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Brain teaser # 7

Others 569 views 4 replies

Find the Next Number in the series!

 

1, 3, 7, 15, 31, 63, 127, _____ 

Give explanation to your answers!

Cheers!!!!!

Replies (4)

Answer is 255......

Explanation:

1x2 + 1 = 3

3x2 + 1 = 7

7x2 + 1 = 15

.

.

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

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

 

255

series differences get doubled in every step.

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


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