Skip to main content

Replies sorted oldest to newest

@El Loro posted:

If the second 3 is not a misprint then the answer is 27, if it should be a 5 then 13.

I would agree with EL. There's no single clear pattern, so - assuming there's not a misprint - the two "3"s suggest two interweaved series:

1, 3, 3, 7, 9, 11, ?

The first series is 1, 3, 9, ? - this is 3 to the power of x, where x = 0 to 3, so "?" = 3 cubed = 27.

The second series is 3, 7, 11 - this is adding "4" each time, so the next number in the series after "?" would be 15.



There's still not that much info, IMO, to be certain that's what's going on, though. I'd want to see some of the other questions on the paper to confirm they're definitely doing interweaved series as part of the test.

Eugene's Lair
Last edited by Eugene's Lair

Coming in a bit late here...

This is a really nice puzzle: for those who haven't seen it before, it's usually presented like this:

Did you ever read Edward De Bono? Fascinating guy, my favorite of his ideas was to solve the problem of slow elevators, rather than coming up with a solution to speed them up, he suggested putting mirrors in the lobby instead!

FM

Add Reply

×
×
×
×
Link copied to your clipboard.
×
×