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How many pairs of consecutive, three-digit multiples of 9 contain the same three digits?

 Jan 20, 2021
 #1
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it is 9

 Jan 20, 2021
 #2
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(145, 154, 289, 298, 334, 343, 478, 487, 523, 532, 667, 676, 712, 721, 856, 865, 901, 910) ==9 such pairs.

 Jan 20, 2021

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