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2005 AMC 12A Question 23

AMC12 · 2005 AMC 12A

Question 23

Two distinct numbers $a$ and $b$ are chosen randomly from the set $\{2, 2^2, 2^3, \ldots, 2^{25}\}.$ What is the probability that $\log_a b$ is an integer?
  1. $\dfrac{2}{25}$
  2. $\dfrac{31}{300}$
  3. $\dfrac{13}{100}$
  4. $\dfrac{7}{50}$
  5. $\dfrac{1}{2}$