[明送分] Probability

1) When two fair coins are tossed, what is the probability of getting exactly one head?

P(exactly 1 head)
= 2C1 X (1/2)^2
= 2 X (1/4)
= 1/2

2. When four fair coins are tossed, what is the probability of getting exactly two heads?

P(exactly 2 heads)
= 4C2 X (1/2)^4
= 6 X 1/16
= 3/8

1) 1/2
2) 3/8

[明送分] Probability
1/2
1/4