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Question
Two coins are tossed together. What is the probability of getting:
(i) at least one head
(ii) both heads or both tails.
Solution
∵ A coin has two faces Head and Tail or H, T
∴ Two coins are tossed
∴ Number of coins = 2 x 2 = 4
which are HH, HT, TH, TT
(i)
At least one head, then
Number of outcomes = 3
∴ P(E) = `"Number of favourable outcome"/"Number of all possible outcome"`
= `3/4`
(ii)
When both head or both tails, then
Number of outcomes = 2
∴ P(E) = `"Number of favourable outcome"/"Number of all possible outcome"`
`2/4 = 1/2`
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