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Mathematics, 06.07.2019 10:50 BaileyElizabethRay

We call a number special if every digit in the number either is a 1 or borders a 1. for example, 11111, 13, 141, 1441, 515151, and 101 are all special, but 10001, 222, 122, and 1333 are not special. how many positive 3-digit numbers are special?

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We call a number special if every digit in the number either is a 1 or borders a 1. for example, 111...
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