ashleighrushing ashleighrushing

25-01-2017
Mathematics

contestada

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

cannot be the leading number?

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apologiabiology apologiabiology

25-01-2017

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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