2007 AMC 8 Problem 3
Attempt Problem 3 of the 2007 AMC 8 below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2007 AMC 8 solutions, or check the answer key.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
3.
What is the sum of the two smallest prime factors of
Answer: C
Small hint:
Factor into primes.
Big hint:
Only distinct prime factors matter when looking for the two smallest prime factors.
Solution:
We can prime factorize to get From this, we can see that only has two prime factors: and The sum of these is
Thus, C is the correct answer.
Problem 3 in other years
- 1985 AMC 8
- 1986 AMC 8
- 1987 AMC 8
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