Question 1206195
.
A group of 2175 students were surveyed about the 
courses they were taking at their college with 
the following results:

1025 students said they were taking Dance.
1087 students said they were taking History.
1115 students said they were taking Math.
585 students said they were taking History and Math.
501 students said they were taking Math and Dance.
537 students said they were taking History and Dance.
243 students said they were taking all three courses.
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I read attentively your post, but did not find any question in it.

<H3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Are you sane ?</H3>



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Edwin, &nbsp;there are minimal basic elementary rules of communicating at this forum.


First rule is that a post should be written clearly and correctly,
and the problem should be sensible &nbsp;(in opposite to be non-sensible).


Second rule is that a post must be complete and contain all necessary data.


Third rule is that a post must contain a question.


Fourth rule is that a post should contain reasonable finite number of questions 
(the best one question, &nbsp;the most - three inter-related questions, &nbsp;but not 6 or 8 questions).



These rules are simple and necessary, &nbsp;and &nbsp;I &nbsp;ALWAYS &nbsp;will insist that they be followed.



You, &nbsp;from your side, &nbsp;apply 1000-ton efforts to break them and to put me down.



Please stop breaking these rules.  &nbsp;&nbsp;Also, &nbsp;please stop putting me down.



Next, &nbsp;why do you think that they want to learn from you about &nbsp;Venn diagram ?


May be, &nbsp;in opposite, &nbsp;they want to learn from &nbsp;ME &nbsp;about &nbsp;Inclusion-Exclusion principle ?



I am the &nbsp;ONLY &nbsp;ONE &nbsp;person at this forum, &nbsp;who supports some order here, &nbsp;during the years.


Without me, &nbsp;it will be &nbsp;MESS &nbsp;in two weeks.



Did I say &nbsp;" in two weeks " ? - &nbsp;&nbsp;No, &nbsp;not in two weeks. - &nbsp;&nbsp;In four days.