Aptitude - Odd Man Out and Series - Discussion

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"No one is as deaf as the man who will not listen."

- (Proverb)

Insert the missing number.

11, 13, 17, 19, 23, 29, 31, 37, 41, (....)

[A].	43	[B].	47
[C].	53	[D].	51

Answer: Option A

Explanation:

Numbers are all primes. The next prime is 43.

Hafiz said: (Fri, Aug 20, 2010 08:54:44 AM)

I think that 13-11=2 17-13=4 19-17=2 23-17=4 .... 41+2=43 the (2,4) (2,4) (2,4 ) is got repeated.

Murali said: (Sun, Jan 23, 2011 03:21:01 AM)

@Hafiz Your Answer is wrong. Because, 13-11=2 17-13=4 19-17=2 23-19=4 29-23=6( Alternative number 2 is not Here) 31-29=2( Alternative number 4 is not here) 37-31=6(Alternative number 2 is not Here) ..... So The Only Answer is Next Prime is 43.

Priya said: (Mon, Aug 8, 2011 02:10:31 PM)

I think it is in this order +2, -2, +2, +2, -4, +4, -2, +2. When ever it is increasing by some number decreasing by same number in the next number.