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How many arrangements are there of the word probability

Probability

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Kris V. | Experienced Mathematics, Physics, and Chemistry TutorExperienced Mathematics, Physics, and Ch...
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There are 11 letters in "probability", and there are 2 b's and 2 i's in "probability".
The number of arrangements is
11!/(2!2!) = 9,979,200

Comments

! is a factorial symbol
n! = 1•2•3 ...•n
1! =1
2! = 1•2 = 2
11! = 1•2...•10•11=