Question
5 coins are tossed together. What is the probability of
getting exactly 3 tails?Solution
If ‘n’ fair coins are tossed, Total number of outcomes in the sample space = 2n The probability of getting exactly ‘r’ number of heads when ‘n’ coins are tossed = nCr/ 2n Therefore, probability = 5C3/25 = 5/16
More Probability Questions
If (7a + b) : (7a - b) = 7:3, then find the value of a:b?
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...- What will come in the place of question mark (?) in the given expression?
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40.5 ÷ [4/5 of (32 + 18) - 29/2] = ? ÷ 102
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