If P(A) denotes the probability of getting an event A. Then P(not getting A) is :

1. 1 - P(A)

2. P(A) - 1

3. P(A)

4. 1 + P(A)

A coin is tossed twice. Find the probability of getting :

(i) exactly one head

(ii) exactly one tail

(iii) two tails

(iv) two heads