1995 AJHSME Problems/Problem 23
Problem
How many four-digit whole numbers are there such that the leftmost digit is odd, the second digit is even, and all four digits are different?
Solution
Count from left to right: There are 5 choices for the first digit, 5 choices for the second, 8 remaining choices for the third, and 7 remaining for the fourth, so there are numbers.
See Also
1995 AJHSME (Problems • Answer Key • Resources) | ||
Preceded by Problem 22 |
Followed by Problem 24 | |
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