A die is rolled. Probability of getting a prime number is:

A die is rolled. Probability of getting a prime number is:
  1. $\dfrac{1}{6}$
  2. $\dfrac{1}{3}$
  3. $\dfrac{1}{2}$
  4. $\dfrac{2}{3}$

Solution

Primes on a die: $\{2,3,5\}$. $P = \dfrac{3}{6} = \dfrac{1}{2}$.

Asked in: IMO

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