Two unbiased coins are tossed. The probability of getting at least one head is:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 3/4
The probability of an event is the number of favourable outcomes divided by the total number of outcomes. “At least one head” means one head or two heads, that is, every outcome except two tails.
Outcomes for two coins: HH, HT, TH, TT, so 4 in all
At least one head: HH, HT, TH, so 3 favourable
Probability \(\displaystyle =\frac{3}{4}\)