AMC 10 Daily Practice Round 3

Complete problem set with solutions and individual problem pages

Problem 6 Easy

Exactly one of the five numbers shown below is not a divisor of Molly's favorite positive integer. Which one is it?

  • A.

    7

  • B.

    9

  • C.

    12

  • D.

    21

  • E.

    28

Answer:B

9=3\times 3, while for the other four answer choices, none of which contains 3^2. Therefore, 9 not necessarily divides Molly's favorite positive integer.

Related Problems
Problem 4 AMC 10 Daily Practice Round 3
Problem 5 AMC 10 Daily Practice Round 3
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Problem 8 AMC 10 Daily Practice Round 3
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