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asked 2016-02-29 13:39:27 
In how many ways can the letters of the english alphabet be arranged so that there are seven letter between the letters A and B, and no letter is repeated?
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answered 2016-03-02 09:05:45 
Position of A and B can be 1-9,  2-10,  3-11 ,..., 18-26 (18 ways)
Remaining 24 letters can be arranged in 24 positions in 24! ways
Position of A and B can be interchanged (2 ways)

Required number of ways
= 18×24!×2
= 24! × 36
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