Math

We call a natural number "odd looking" if all its digits are odd.How many 4-digit odd looking numbers are there?

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asked by John
  1. Each of the 4 places can be filled with any of the 5 odd digits
    number of "odd-looking" number
    = 5*5*5*5
    = 625 , assuming that digits my be repeated

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    posted by Reiny

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