Three different coins are tossed together. Find the probability of getting at least two tails.
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Solution
When three coins are tossed together, the possible outcomes are
HHH, HTH, HHT, THH, THT, TTH, HTT, TTT
∴ Total number of possible outcomes = 8
Favourable outcomes of at least two tails are THT, TTH, HTT, TTT
∴ Total number of favourable outcomes = 4
∴ P(at least two tails) =`4/8=1/2`
Concept: Basic Ideas of Probability
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