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August 30, 2015

Homework Help: Math

Posted by Maria on Monday, February 22, 2010 at 2:50am.

If 3 people are asked what day of the week they were born, find the probability that
i) 2 or 3 are the same.

ii) only 2 people are the same.
- is this 1/7 x 1/7 ??

If 4 people are asked what day of the week they were born, what is the probability that 2 or more people were born on the same day.
- How do I show this??

Using this idea, work out how many people need to be asked for their birthdate so that at least two people sharing their birthdate will have a chance of 1/2.

Thank you

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