2020 AMC 8 Problem 12
Attempt Problem 12 of the 2020 AMC 8 below, then check your answer against the video solution and professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2020 AMC 8 solutions, or check the answer key.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
12.
For a positive integer the factorial notation represents the product of the integers from to For example:
What value of satisfies the following equation?
Answer: A
Small hint:
Cancel the factor from
Big hint:
Rewrite so the factor cancels cleanly
Video solution:
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Written solution:
Because the equation becomes Canceling gives so
Thus, the correct answer is A.
Problem 12 in other years
- 1985 AMC 8
- 1986 AMC 8
- 1987 AMC 8
- 1988 AMC 8
- 1989 AMC 8
- 1990 AMC 8
- 1991 AMC 8
- 1992 AMC 8
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