Posted by **Brian Taylor** on Thursday, March 21, 2013 at 3:21pm.

How many different ways can an elf climb a ten-step staircase if he or she climbs only one of two steps a time?

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**j**, Friday, December 11, 2015 at 8:38am
89

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**Raj**, Monday, December 21, 2015 at 8:13pm
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