A carton contains 25 bulbs, 8 of which are defective. What is the probability that if a sample of 4 bulbs is chosen, exactly 2 of them will be defective ?
Pick one
A) (8/25) x (7/24) x (17/23) x (16/22)  B) (4C2) x (8/25) x (7/24) x (17/23) x (16/22)  C) (8/26) x (8/24) x (17/33) x (16/22)  D) None of these  E) Cannot be determined
Explanation :   The probability that exactly two bulbs are defective and exactly two are not defective will be given by   (4C2) x (8/25) x (7/24) x (17/23) x (16/22)   Answer : (4C2) x (8/25) x (7/24) x (17/23) x (16/22)
<result>B</result>
A carton contains 25 bulbs, 8 of which are defective. What is the probability that if a sample of 4 bulbs is chosen, exactly 2 of them will be defective ?