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प्रश्न
In a game, the entry fee is ₹ 150. The game consists of tossing a coin 3 times. Dhana bought a ticket for entry. If one or two heads show, she gets her entry fee back. If she throws 3 heads, she receives double the entry fees. Otherwise, she will lose. Find the probability that she just gets her entry fee
उत्तर
Sample space (S) = {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}
n(S) = 8
Let B be the event of getting her entry fee ...(one or two heads to show)
n(B) = Probability of one head + Probability of 2 head
= `3/8 + 3/8`
= `6/8`
= `3/4`
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