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A game consists of tossing a one-rupee coin three times, and noting its outcomee each time. Find the probability of getting (i) three heads, (ii) at least 2 tails. |
Answer» Correct Answer - ` (i) 1/8 (ii) 1/2` When a coin is tossed 3 times, all possible outcomes are HHH, HHT, HTH, THH, HTT, THT, TTH, TTT. Number of all possible outcomes = 8. (i) P(getting 3 heads) = `1/8`. (ii) At least 2 tails means 2 or 3 tails. All such cases are HTT, THT, TTH,TTT. Their number is 4. ` :. ` P(getting at least 2 tails) = `4/8 = 1/2`. |
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