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Help on math challenge1B(c) amc8/mathcounts winter 2017-2018 counting and probability

 
 
ZongWeston的头像
Help on math challenge1B(c) amc8/mathcounts winter 2017-2018 counting and probability
ZongWeston - 2018年01月14日 Sunday 10:38
 

for 5.18, it says That is, we only care how many of them are both on the same day of the week. What does it mean by that?

 
ReynosoDavid的头像
Re: Help on math challenge1B(c) amc8/mathcounts winter 2017-2018 counting and probability
ReynosoDavid - 2018年01月16日 Tuesday 10:09
 

Say Alice and Charles were born on Tuesday, Bob on Wednesday and Desiree on Friday. We would get the same outcome if say Alice was born on Friday, Bob and Desiree on Tuesday, and Charles on Wednesday. That is 2 people were born on Tuesday, 1 on Wednesday and 1 on Friday.

 
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