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jishnu prakash Grade: 12
        An experiment has 10 equally likely outcomes.Let A and B be 2 non-empty events of the experiment.If A consists of 4 outcomes,the no. of outcomes that B must have so that A and B are independent is ?


Ans given is
" 5 or 10 ".
Please explain.

6 years ago

Answers : (1)

Sudheesh Singanamalla
114 Points
										

As a and b are independent events.


P(A intersection B) = P(A).P(B)


N of (A intersection B) / 10 = N(A) .N(B) / 100 = 4 * N(B) /100


 


5 * N(A intersection B) = 2N(B)


5 | 2 N(B) ==> 5 | N(B)  doesnot divide 2


 


therefore N(B) = 5 or 10

6 years ago
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