TWO FLOPPIES ARE SELECTED AT A RANDOM WITHOUT REPLACEMENT WITHOUT FROM A BOX CONTAINING 7 GOOD AND 3 DEFECTIVE FLOPPIES. LET A BE THE EVENT THAT THE FIRST FLOPPY DRAWN IS DEFECTIVE, AND LET B THE EVENT THAT THE SECOND FLOPPY DRAWN IS DEFECTIVE.

FIND THE CONDITIONAL PROBABILITIES P(B/A) AND P(B/A)

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Answers

2014-04-05T20:50:32+05:30
 
Solution : They are dependent events

The probability of A = 3/7
The probability of B/A= 2/6
P(B/A) and P(B/A) = P(B/A) X P(B/A)
                           = 2/6 X 2/6
                           =4/36
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