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| Hello, My question is the following: How many 8-digits number are there with their digits in decreasing order; Headmaster
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The digits in decreasing order are 9876543210. This forms a 10-digit number. You can form an 8-digit number with its digits in decreasing order by removing any two of the digits from 9876543210. How many ways can you choose the two digits to remove? Penny |
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