SOLUTION: A box contain 74 brass washers ,86 steel washers and 40 aluminium washers three washers are down at random from the box without replacement .Determine the probability that all thre

Algebra ->  Probability-and-statistics -> SOLUTION: A box contain 74 brass washers ,86 steel washers and 40 aluminium washers three washers are down at random from the box without replacement .Determine the probability that all thre      Log On


   

Question 301618: A box contain 74 brass washers ,86 steel washers and 40 aluminium washers three washers are down at random from the box without replacement .Determine the probability that all three are steel washers
Answer by Fombitz(32388) About Me  (Show Source):
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74 B, 86 S, 40 A gives 200 total washers.
P(1st S washer)=86/200
P(2nd S washer)=85/199
P(3rd S washer)=84/198
P(3 S washer)=(86/200)(85/199)(84/198)=5117/65670