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Mathematics
Combinatorics
Permutations
Penelope is organizing textbooks on her bookshelf. She has an English textbook, a biology textbook, and a physics textbook. How many different ways can she line the textbooks up on her bookshelf?
1 answer
Penelope can line up the textbooks in 3! = 3*2*1 = <<3!*=6>>6 different ways. Answer: \boxed{6}.
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