Multiple choice

A fair die is tossed repeatidly. Mr. A wins if it is $1$ or $2$ and Mr. B wind if it is $3, 4, 5$ or $6$ . The probability that A wins if the die is tossed indefinitely, is

  1. $\dfrac {1}{3}$
  2. $\dfrac {5}{21}$
  3. $\dfrac {1}{4}$
  4. $\dfrac {2}{5}$
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A Correct answer
AI explanation

The probability of Mr. A winning on any given toss is 2/6, or 1/3. Using the sum of an infinite geometric series for his cumulative chances of winning, the probability is the initial chance 1/3 divided by one minus the chance of both players losing, which is 1 minus 0. This calculates to 1/3.