Critical Thinking Puzzles: What is the number?

August 14, 2008

what is number in this series
1,16,36,__,81,100,144

a)64
b)61
c)49
d)144

please explain the logic...

Anonymous said...: The answer is a)64

it is a series of squares of prime numbers; August 20, 2008 at 3:05 PM
Anonymous said...: it is a series of squares of non-prime numbers; August 20, 2008 at 3:08 PM
Anonymous said...: Who Knows :L; September 8, 2008 at 1:29 AM
Anonymous said...: Itz a series of squares of non-prime numbers.. so Ans is 64.......; October 3, 2008 at 10:42 PM
Help The Poor said...: 64....
v r squaring non prime nums; October 9, 2008 at 9:11 PM
Unknown said...: ans is 64

the series is squares of non prime numbers; April 26, 2009 at 6:37 PM