Radha tossed three unbiased coins. What is the probability of getting at least 2 heads?
Correct Answer: Option B
On tossing three coins, n(S) = 2 × 2 × 2 = 8
Sample space = {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT} (∵ H = head, T = tail)
Number of events with at least two heads, n(E) = 4
∴ Probability of getting at least 2 heads = n(E)/n(S) = 4/8 = ½
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