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 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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