Probability I

Probability Level 1

What is the probability of getting exactly 29 days in a month ?

If you liked this problem, you should try the second problem of this series Probability II .

1/24 1/4 1/12 1/48

Smit Kiri by Smit Kiri , 23, India

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1 solution

Smit Kiri
Apr 23, 2014

Its simple. 29 days in a month comes in every 4 years or in 48 months. Thus, the probability is 1/48.

2 Helpful 0 Interesting 0 Brilliant 0 Confused

You need to be careful. There are (at least) 29 days in January. Can you clean up the wording?

Calvin Lin Staff - 7 years, 1 month ago

and also there are only two different types of years ! i.e. leap year and a normal year so why can't the answer be (1/24)

Mayank Holmes - 6 years, 12 months ago

Strictly speaking, leap years do not occur once every 4 years, as is commonly believed. For example, 2100 will not be a leap year, despite being divisible by 4. See http://en.wikipedia.org/wiki/Leap_year for more details.

Jon Haussmann - 6 years, 11 months ago

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