Insert the missing number: 15, 31, 63, 127, 255, ?

Insert the missing number: 15, 31, 63, 127, 255, [?]
nagarajanpc
Asked Jan 31, 2010
Edited Jan 31, 2010
511. It's times two plus one. 15 x 2 = 30 + 1 = 31 x 2 = 62 + 1 = 63 x 2 = 126 + 1 = 127 x 2 = 254 + 1 = 255 x 2 = 510 + 1 = 511.
Oni_Kami
Answered Jan 31, 2010
511

divinegal7
Answered Jul 20, 2010
Miltiply the number with itself + 1
a7mad_samir
Answered Jul 21, 2010
the answer is 511...(X x 2) +1 = Y
Mafyoo
Answered Aug 28, 2010
even easier way to look at it (for ppl who's brains dont like the word "multiply")

add number to itself, then add 1.

15+15+1= 31

31+31+1= 63

63+63+1=127

and so on.
Bootsnboards
Answered Apr 21, 2012
84/14 12/
vijay
Answered Jul 19, 2010

TIP: If it's not your answer to this question, please click "Leave a Comment" button under the question to communicate with the question owner.

Categories