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November 24, 2014

November 24, 2014

Posted by **partha** on Friday, September 20, 2013 at 1:21pm.

- maths -
**Steve**, Friday, September 20, 2013 at 1:38pmThere are 4! ways to arrange m,a,t,h in the 1st 4 places.

Of these, 3! have t as the last letter.

The remaining letters are aaabhr, which can be arranged in 6!/3! ways.

So, we have (4!-3!)(6!/3!) ways with t not in the 4th place.

Add to that (3!)(6!/3! - 5!/3!) ways of having t in 4th place and b not in 5th place.

Looks like 2760 ways to me.

If that's incorrect, I'm sure you can find the flaw.

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