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| Math Central | Quandaries & Queries |
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Question from CAROL, a parent: I NEED TO KNOW HOW MANY 7 DIGIT COMBINATIONS FROM 0-9 THERE ARE WITHOUT ANY REPEATES, OR WHAT THOSE COMBINATIONS ARE? |
Carol,
There are 120 of them. One way to look at this question is that it is the same as the number of 3 digit combinations from 0-9. Why is that? This might make it easier for you to count them.
Penny
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