Question 150
If three unbiased coins are tossed then the probability that at least two coins give heads is
Solution
The order of the appearance of heads and tails does not matter here.
So we can have only 4 distinct possible combinations: HHH, HTH, HTT, TTT
From this, our desired situations are HHH and HTH.
Hence, the probability = 2/4 = 1/2
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