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25 January, 07:39

How many seven-digit numbers are there when 0 and 5

cannot be the leading number?

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Answers (1)
  1. 25 January, 08:06
    0
    1,2,3,4,6,7,8,9

    8 numbers

    if you can repeat then

    8*10⁶ numbers or 8000000 different numbers

    if you can use each number only once then

    8*9*8*7*6*5=120960 different numbers
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