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31. Probability
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Q45 of 249 Page 31

Mark the correct alternative in each of the following:

A bag contains 5 red and 3 blue balls. If 3 balls are selected drawn at random without replacement, then the probability of getting exactly one red ball is


Total Red Balls = 5


Total Blue Balls = 3


M = Event getting Red ball



N = Event getting Blue ball



Now,


P(Getting Exactly one red ball) = P(RBB) + P(BRB) + P(BBR)




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43

Mark the correct alternative in each of the following:

If A and B are two independent events such that P(A) = 0.3, P(A ∪ B) = 0.5, then P(A/B) – P(B/A) =


44

Mark the correct alternative in each of the following:

A flash light has 8 batteries out of which 3 are dead. If two batteries are selected without replacement and tested, the probability that both are dead is


46

Mark the correct alternative in each of the following:

A bag contains 5 red and 3 blue balls. If 3 balls are drawn at random without replacement, then the probability that exactly two of the three balls were red, the first ball being red, is


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47

Mark the correct alternative in each of the following:

In a college 30% students fail in Physics, 25% fail in Mathematics and 10% fail in both. One student is chosen at random. The probability that she fails in Physics if she has failed in Mathematics is


Questions · 249
31. Probability
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