Classical probability, simple events and elementary probability problems.
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Q1 · Probability · MEDIUM
Two dice are rolled simultaneously. What is the probability that the sum of the numbers appearing on them is a prime number?
Q2 · Probability · HARD
A bag contains 5 red, 4 blue, and 3 green balls. Three balls are drawn at random without replacement. What is the probability that all three balls are of different colors?
Q3 · Probability · EASY
A card is drawn at random from a well-shuffled deck of 52 cards. What is the probability that the card drawn is either a king or a spade?