If you flip a coin 3 times, what is the probability of exactly 2 heads?

If you flip a coin 3 times, what is the probability of exactly 2 heads?

Approach: Use binomial coefficient (3 choose 2) / 2^3.

3/8. Possible outcomes: HHT, HTH, THH. Total outcomes: 8. 3/8 = 0.375.

Follow-up: Probability of at least 2 heads?

Key concepts: binomial distribution, combinations.