2002 AMC 12A Problem 6

Below is the professionally curated solution for Problem 6 of the 2002 AMC 12A, from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2002 AMC 12A solutions, or check the answer key.

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Concepts:inequalitysmall cases

Difficulty rating: 1350

6.

For how many positive integers mm does there exist at least one positive integer nn such that mnm+n?m \cdot n \le m + n?

44

66

99

1212

infinitely many

Solution:

Taking n=1,n = 1, the inequality becomes mm+1,m \le m + 1, which holds for every positive integer m.m.

So every positive integer mm works, and there are infinitely many.

Thus, the correct answer is E.

Problem 6 in Other Years