Posted by **puzzled** on Sunday, January 30, 2011 at 12:20am.

Of all the videotapes in a large shipment, 21% have a defective tape, 16% have a defective case, and 11% have both defects. If you purchase one of the videotapes in this shipment, find the probability that it has the following.

(a) A defective tape or a defective case.

p = .26

(b) A good tape or a good case.

p = ?

(c) A good tape and a good case.

p = .74

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