Book: RS Aggarwal - Mathematics
Chapter: 24. Probability
Subject: Maths - Class 8th
Q. No. 3 of Exercise 24A
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In a single throw of two coins, find the probability of getting (i) both tails, (ii) at least 1 tail,(iii) at the most 1 tail.
(i) A coin has two sides a head(H) and a tail(T), and there are two such coins.
There are Xm possible outcomes.
That is 22 = 4 and they are HH, HT, TH, TT
All possible outcomes are HH, HT, TH, TT.
Total number of outcomes = 4
Chances of getting 2 tails = 1, that is TT
Probability P() = 
Probability of getting a tail P(both T) = 
= 
(ii) A coin has two sides a head(H) and a tail(T), and there are two such coins.
There are Xm possible outcomes.
That is 22 = 4 and they are HH, HT, TH, TT
All possible outcomes are HH, HT, TH, TT.
Total number of outcomes = 4
Chances of getting atleast one tail = 3, that is HT, TH, TT.
Probability P() = 
Probability of getting a tail P(atleast 1 T) = 
=
(iii) A coin has two sides a head(H) and a tail(T), and there are two such coins.
There are Xm possible outcomes.
That is 22 = 4 and they are HH, HT, TH, TT
All possible outcomes are HH, HT, TH, TT.
Total number of outcomes = 4
Chances of getting atmost 1 tail = 3, that is HT, TH, TT.
Probability P() = 
Probability of getting a tail P(atmost 1 T) = 
=
