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Re: and/or
Posted:
Nov 24, 1997 4:16 AM


Giving formulae as such without appropriate context is bound to confuse students.
ChiTien
Original Message From: Charles J. Masenas <u6420@btv.ibm.com> To: Tad Watanabe <tad@saber.towson.edu> Cc: MathTeach <mathteach@forum.swarthmore.edu> Date: Friday, November 21, 1997 11:23 AM Subject: Re: and/or
>Message Dated: Thu, 20 Nov 1997 19:05:38 EST >>> >>> This has very little to do with Josh's original post, but many of my >>> students find it extremely confusing the two formulas (formulae?): >>> >>> P(A or B) = P(A) + P(B)  P(A and B) >>> >>> P(A and B) = P(A)*P(BA) > >It might help to use Venn diagrams for sample spaces. For example, the >events associated with drawing aces in a deck of cards can be viewed >as an area in sample space. The probability of drawing an ace or a >diamond can be translated to an area in sample space. Each of the >terms in the above formulas translates to an area. > > >Regards, >Charles J. Masenas > > >



