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Geraldine is picking a four-digit password by using the digits 0 through 9. she can use each digit only once. how many different pass words are possible?
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Geraldine is picking a four-digit password by using the digits 0 through 9. she can use each digit only once. how many different pass words are possible?

User Dan Collins
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the answer is 10*9*8*7 = 5040
User Fei Yao
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