September 30, 2008

Brain Teaser, #5.

Suppose we have a sequence:
(1), (2, 3), (4,5,6), (7,8,9,10), (11,12,13,14,15),...
where (1) is the first part of the sequence, (2,3) the second part, etc.

What is the first number of the 100th part of the sequence?

2 comments:

  1. AnonymousOctober 1, 2008 at 11:45 PM

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  2. .mk.October 4, 2008 at 5:48 PM

    4951. Don't ask me how you'd actually figure this out.

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