1.

A lot contains 15 items of which 5 are defective. If three items are drawn at random, find the probability thatnone of the three is defective. Do this problem directly.

Answer»

SOLUTION :As none of the 3 items are defective we have to draw 3 non-defective items one after another.`therefore` Their PROBABILITY=`10/15xx9/14xx8/13`


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