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# A and B Are Friends. Ignoring the Leap Year, Find the Probability that Both Friends Will Have: The Same Birthday? - ICSE Class 10 - Mathematics

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ConceptSimple Problems on Single Events

#### Question

A and B are friends. Ignoring the leap year, find the probability that both friends will have:

the same birthday?

#### Solution

Out of the two friends, A's birthday can be any day of the year. Now, B's birthday can also be any day of 365  days in the year.

We assume that these 365 outcomes are qually likely.

P(A and B have the same birthday)

=1-p(both have different birthday)

=1-364/365 [Using p(E')=1-p(E)]

1/365

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#### Video TutorialsVIEW ALL [3]

Solution A and B Are Friends. Ignoring the Leap Year, Find the Probability that Both Friends Will Have: The Same Birthday? Concept: Simple Problems on Single Events.
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