Probability ncert solutions Chapter 15 Exercise 15.1 Question 7
7. It is given that in a group of 3 students, the probability of 2 students not having the same birthday is 0.992. What is the probability that the 2 students have the same birthday?
Solution:
Let E be the event that 2 students do not have the same birthday.
It is given that P(E)=0.992
We have
{where
is probability of not happening of event E or we can say that it is the probability of 2 students having the same birthday.}
Therefore, Probability of 2 students having the same birthday=0.008
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