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math

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there are 122 houses eacg has number on letter box ,how many times does the digit 2 appear on the letter boxes?

  • math -

    single digit : 2 --->1

    double digit:
    12---->1
    20, 21, ... 29,---> 10
    32, 42, 52, 62, 72, 82, 92 ---> 7

    triple digit
    102 , 112, 121, 122 --->4

    see if I missed any, then add them up

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