2009 AMC 8 Problems/Problem 16
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Problem
How many -digit positive integers have digits whose product equals
?
Solution
With the digits listed from least to greatest, the -digit integers are
.
can be arranged in
ways, and the other three can be arranged in
ways. There are
-digit positive integers.
See Also
2009 AMC 8 (Problems • Answer Key • Resources) | ||
Preceded by Problem 15 |
Followed by Problem 17 | |
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