2021 Fall AMC 10A Problems/Problem 5
The six-digit number is prime for only one digit
What is
Solution 1
By divisibility rules, when the number
is divisible by
When
the number
is divisible by
When
the number
is divisible by
When
the number
is divisible by
Thus, by the process of elimination we have that the answer is
~NH14
See Also
2021 Fall AMC 10A (Problems • Answer Key • Resources) | ||
Preceded by Problem 4 |
Followed by Problem 6 | |
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