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math

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find the number of two digit natural numbers such that the tens digit is greater than the units digit.

  • math -

    20 21
    30 31 32
    ...
    90 91 92 ... 98

    2+3+...+9

    = 44

  • math -

    Write in extension the set S of the two digit natural integers whose tens digit is twice that of the unit digit

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