leilei2994 leilei2994
  • 15-12-2022
  • Mathematics
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an integer is called parity-monotonic if its decimal representation $a {1}a {2}a {3}\cdots a {k}$ satisfies $a {i}a {i 1}$ if $a {i}$ is even. how many four-digit parity-monotonic integers are there?

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