GATE ME 2014 Set 2 — Question 14
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Engineering Mathematics → Probability → Axioms of Probability
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Question
A box contains 25 parts of which 10 are defective. Two parts are being drawn simultaneously in a random manner from the box. The probability of both the parts being good is
Correct answer
(A) (7)/(20)
Solution
Total number of parts = 25
Number of defective parts = 10
Number of good parts = 25 - 10 = 15Two parts are drawn simultaneously. The total number of ways to choose 2 parts from 25 is .
The number of ways to choose 2 good parts from 15 is .Probability .Thus, the correct option is (A).
Number of defective parts = 10
Number of good parts = 25 - 10 = 15Two parts are drawn simultaneously. The total number of ways to choose 2 parts from 25 is .
The number of ways to choose 2 good parts from 15 is .Probability .Thus, the correct option is (A).
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