Correct Answer - Option 3 : 1/2
Given:
Number of unbiased coin = 3
Calculation:
Total number of results when three coins are tossed = 23 = 8
Favourable result = (TTH, THT, HTT, TTT)
Number of favourable results = 4
∴ Probability of at least two heads = 4/8 = 1/2