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Climbing the stairs (Posted on 2002-09-05) Difficulty: 3 of 5
A stairway has 100 steps. You can climb it by one step at a time, or by two steps. How many different ways to ascend this stairway exist?

See The Solution Submitted by levik    
Rating: 3.3333 (12 votes)

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re(2): 2 answers Comment 24 of 24 |
(In reply to re: 2 answers by John zadeh)

Nevermind, the way to solve it is realized that it is only possible to take 1 step an even number of times (or not to take 1 step at all)

The solution is 100C0 + 100C2 + 100C4 + 100C6.......100C100

  Posted by John zadeh on 2009-11-11 12:38:42

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