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The answer in the book is 3, but I don't get it.

I thought it woud be a permutation because order does matter. So I assume that since there are 4 objects and 4 blanks to fill the permutation counting formula would be (4!)/(4-4)!

Therefore this would equal 4*3*2*1/1=24

The book says the answer is three...am I doing something wrong?

HELLLP :yuck: