Question

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Find the number of permutations in the word “freezer”

Answer 1

Permutations with repetitions (i.e. identical items) are given by
P(n)=n!/(n1!n2!n3!...nk!) when there are k different items, with ni equal to the quantity of each, and n=n1+n2+n3+...+nk.

Example:
How many ways to arrange 2 apples and 3 oranges on a line?
P(5)=5!/(2!3!)=5*4/(1*2)=10

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