Five counterfeit coins are mixed with nine authentic coins. If two coins are drawn at random, the probability that one is authentic and one is counterfeit is:
A. 1/2
B. 45/91
C. 1/14
D. 4/45
E. None of these
Solution and answer please.. :))
A. 1/2
B. 45/91
C. 1/14
D. 4/45
E. None of these
Solution and answer please.. :))
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Answer:
Read the question carefully.
Five counterfeit coins are mixed with nine authentic coins. If two coins are drawn at random, the probability that one is authentic and one is counterfeit is:
Therefore, our required answer will be:
We are multiplying by 2 because 2 coins are drawn.
lets find the probability of getting authentic coins:
lets find the probability of getting counterfeit coins:
Therefore, required probability:
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