ISRO | ISRO CS 2014 | Question 37
The probability that two friends are born in the same month is ?
(A) 1/6
(B) 1/12
(C) 1/144
(D) 1/24
Answer: (B)
Explanation: Probability of a person to be born in a specific month = 1/12
Probability of both friends born in a specific month = 1/12 * 1/12
Since there are 12 months in a year,
Probability of both friends born in january = 1/12 * 1/12
Probability of both friends born in february = 1/12 * 1/12.. and so on
Probability of both friends born in same month= 12 * ( 1/12 * 1/12) = 1/12
So, option (B) is correct.
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