Discussion of Question with ID = 058 under Probability

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Question

Karmjeet and Sham are friends. What is the probability that both will have different birthdays, ignoring a leap year?

A

${364/365}$.

B

$21/365$.

C

$365/365$.

D

$369/365$.

Soln.
Ans: a

The birthday of second friend has 365 outcomes. If it is not to match the birthday of the first friend, the number of favorable outcomes is 365 - 1 = 364. So probability is 364/365.


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