Question 1043289
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BANANAS

They must all start and end with N like this:

NBAAASN

This amounts to getting the number of distinguishable 
arrangements of BAAAS to place between the two N's.

Since there are three indistinguishable A's in BAAAS, it's

{{{5!/3!}}}{{{""=""}}}{{{(5*4*3*2*1)/(3*2*1)}}}{{{""=""}}}{{{120/6}}}{{{""=""}}}{{{20}}} ways:

Edwin</pre>