Posts Tagged ‘great brain teasers’

Best Brain Teasers. Part 3.

Tuesday, August 27th, 2013

What is the next number in this series:

10, 11, 12, 13, 14, 15, 16, 17, 20, 22, 24, 31, 100, ??

Best Brain Teasers. Part 2.

Tuesday, August 27th, 2013

To the nearest tenth of a percent, what percentage of positive integers have a “7” as at least one of the digits?