daking7969 daking7969
  • 21-07-2022
  • Mathematics
contestada

how many ten digit numbers have at least two equal digits

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drawmw drawmw
  • 21-07-2022

Answer:

A ten digit number without any equal digits is a permutation of 0,1,2,3,4,5,6,7,8,9.

Assuming the first digit cannot be zero, there are 9×9! such permutations.

In total there are 9×109 ten digit numbers so you can easily calculate the probability.

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vvv444 vvv444
  • 01-08-2022
Permutation of 0,1,2,3,4,5,6,7,8,9
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