July 31, 201015 yr Level 3 can help you learn more. However, it is not necessary for everyone to follow Level 3. Try the following question -If you ask 23 random people their birth dates, what are the chances that at least two will match?If you ask 40 random people their birth dates, what are the chances that at least two will match?If you ask 60 random people their birth dates, what are the chances that at least two will match?Surprisingly, with only 23 people, the probability of at least one match is about 0.5073. With 40 people, the probability is about 0.8912, and with 60 people, the probability is about 0.9941Why? How? Have a look by clicking here
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