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Q.

An unbiased coin is tossed to get 2 points for turning up a head and one point for the tail. If three unbiased coins are tossed simultaneously, then the probability of getting a total of odd number of points is

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a

18

b

38

c

12

d

14

answer is A.

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Detailed Solution

3 Coins are tossed

S=HHH, HHT, HTH, THH, TTH, THT, HTT, TTT

no of points ={6, 5, 4, 3}

n(S)=23=8    E=getting odd no. of points

n(E)=4 ⇒ P(E)=48=12

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An unbiased coin is tossed to get 2 points for turning up a head and one point for the tail. If three unbiased coins are tossed simultaneously, then the probability of getting a total of odd number of points is