jkersen449 jkersen449
  • 19-12-2022
  • Mathematics
contestada

we call a number peachy if every digit in the number is either a $3$ or next to a $3.$ for example, the numbers $333,$ $83,$ $303,$ and $3773$ are all peachy, but the numbers $32523,$ $786,$ $340,$ and $3999$ are not peachy. how many positive $3$-digit numbers are peachy?

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