Single-event probability with coins, dice, balls.
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Q1 · Probability · EASY
A bag contains 5 red balls, 4 blue balls, and 3 green balls. If one ball is drawn at random from the bag, what is the probability that it is either red or green?
Q2 · Probability · EASY
Two dice are thrown simultaneously. What is the probability that the sum of the numbers on the two dice is 7?
Q3 · Probability · MEDIUM
A box contains 6 white balls and 4 black balls. If two balls are drawn at random one after another without replacement, what is the probability that both balls are white?
Q4 · Probability · MEDIUM
A coin is tossed three times. What is the probability of getting at least two heads?
Q5 · Probability · HARD
A bag contains 8 balls numbered from 1 to 8. Three balls are drawn at random without replacement. What is the probability that the ball numbered 5 is among the three balls drawn?