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प्रश्न
Two coins are tossed once. Find the probability of getting
1) 2 heads
2) at least 1 tail.
उत्तर
When two coins are tossed, the sample space, S = {(H, H), (H, T), (T, H), (T, T)}
Thus, the total number of outcomes = 4
1) Let A be the event of getting 2 heads.
Thus, outcome favouring A is {(H, H)}
`∴ P(A) = 1/4`
2) Let B be the event of getting at least 1 tail
At least 1 tail means 1 tail or 2 tails.
The outcomes favouring B is {(H, T), (T, H), (T, T)}
`∴ P(B) = 3/4`
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