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2011 AMC 10B Question 13

AMC10 · 2011 AMC 10B

Question 13

Two real numbers are selected independently at random from the interval $[-20, 10].$ What is the probability that the product of those numbers is greater than zero?
  1. $\dfrac{1}{9} $
  2. $\dfrac{1}{3} $
  3. $\dfrac{4}{9} $
  4. $\dfrac{5}{9} $
  5. $\dfrac{2}{3} $