write down the numbers that can be made using the digits (a) 1 and 9
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Using only one digit: 1, 9 Show more…
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Arrange the digits 0 through 9 so that the number formed by the first (leftmost) digit is divisible by 1, the number formed by the first 2 (leftmost) digits is divisible by 2, the number formed by the first 3 (leftmost) digits is divisible by 3, and so forth. What is the 10-digit number? If you were only allowed to use the digits 1 through 9, what would the 9-digit number be?
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