Question
Thu February 02, 2012 By: Kumar Krishna

there are

Expert Reply
Fri February 03, 2012
Probability of choosing defective pen = 4/10 , Probability of choosing normal pen = 6/10
Now , probability that out of 5 pen 2 are dfective is = 5C2 * (4/10)2 * (6/10)= 216/625
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