Posted by **Ismail** on Wednesday, October 20, 2010 at 6:21pm.

A word made by writing the seven letters used to spell "EXAMPLE" in some order. Find how many different 'words' are possible in each of the following cases.

a) The first and the last letter are each "E"

b) The two letters "E" are next to each other.

c) The two letters "E" are not next to each other.

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