REDINSANITY7639 REDINSANITY7639
  • 12-11-2021
  • Mathematics
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how many three-digit positive integers have exactly two digits that are the same?

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jtcolvert
jtcolvert jtcolvert
  • 12-11-2021

there are 9∗9∗8 three digit numbers where all digits are different so 1000−9∗9∗8 which have at least two digits that are the same and then there are 9 numbers which have exactly three same digits so the number of three digit numbers where exactly two digits are the same is 1000−9∗9∗8−9=343.Answer:

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