Conditional probability · Playing cards · difficulty 2 of 5
At least one red card
You draw 2 cards at random, without replacement, from a well-shuffled standard 52-card deck (26 red, 26 black). A friend looks at them and tells you that at least one is red. What is the probability that both are red?
Answer with a probability. First lock in a gut guess with an 80% range, then solve it properly, then watch a simulation settle on the truth.
More conditional probability puzzles
- A six is showing · Board games
- At least one boy · Family
- The flagged transaction · Fraud detection
- The host knows · Game show
- Three boxes, one gold coin · Antique shop
- Which die was it? · Board games
All conditional probability puzzles · All puzzles · Market making game