Three-digit code
The five cards with the numbers 1, 2, 3, 4, and 5 put together all three-digit odd numbers. How many are there?
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Showing 2 comments:
Dora
Hi may I know why the 2nd digit has 4 options since there is only 3 odd numbers, thank you.
Student
The solution is OK. The last digit can be 1,3,5, so three digits. The middle digit can be 5-1 =4 digits possible. The first digit can be 4-1=3 digit.
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