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Three unbiased coins are tossed simultan...

Three unbiased coins are tossed simultaneously. Find the probability of getting
(i) exactly two heads, (ii) at least two heads, (iii) at most 2 heads.

Text Solution

Verified by Experts

The correct Answer is:
Sample space `HHH, TTT, HTT, THT, TTH, THH, HTH, HHT`
(i) P(exactly 2 heads) `=(3)/(8)`
(ii) P(atleast 2 heads) `=(4)/(8)=(1)/(2)` [Favourable cases `HHT, HTH, HHT, HHH`]
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