Ahsome
  • Ahsome
A combination question
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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Ahsome
  • Ahsome
How many 4-digit numbers can be made from the numbers 1,3,5,7,9 and 0 if the numbers can be repeated (Remember - a number cannot start with 0)
wolf1728
  • wolf1728
You have six digits to work with, each of which can be repeated. So, I'd say your answer is 6*6*6*6 which equals 36*36 which equals 1,296
Ahsome
  • Ahsome
Nope, its 1080 :/ (remember at 0 cannot be used in the start)

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wolf1728
  • wolf1728
okay then - sorry
Ahsome
  • Ahsome
@wolf1728, I got it!
ChillOut
  • ChillOut
_ * _ * _ *_ The first number can't be 0, so you you have 5 numbers to work with for the first spot. 5 * _ * _ * _ The other ones can repeat, so we can fill the other spots with all numbers - 6 5 * 6 * 6 * 6 = 1080.

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