When two coins are tossed simultaneously, the possible outcomes are
HH, HT, TH, TT

Total number of outcomes = 4

1)Probability of getting exactly one head
Favourable outcomes = HT, TH (2 outcomes)
Probability = 2/4 = 1/2

2)Probability of getting two heads
Favourable outcome = HH (1 outcome)
Probability = 1/4

3)Probability of getting at least one head
Favourable outcomes = HH, HT, TH (3 outcomes)
Probability = 3/4

4)Probability of getting no head
Favourable outcome = TT (1 outcome)
Probability = 1/4
I hope you got your answer.