Objective Type Question and Answers On Class 12 Maths Chapter 13 Probability

1 If P(x) = 2/15; y = 1, 2, 3, 4, 5, 0 otherwise then P|x = 1 or 2| is

A 1/15

B 2/15

C 1/5

D None of these

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Answer:1/5

2 If one card is drawn out of 52 playing cards, the probability that it is an dice is

A 1/26

B 1/13

C 1/52

D 1/4

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Answer:1/13

3 Two number are chosen, one by one without replacement from the set of number A = {1, 2, 3, 4, 5, 6} then the probability that minimum value of two number chosen is less than 4 is

A 14/15

B 1/15

C 1/5

D 8/5

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Answer:1/15

4 If A and B are events such that P (A∪B) = 3/4. P(A∩B) = 1/4, P(a) = 2/3 then P(AB) is

A 3/8

B 5/8

C 5/12

D 1/4

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Answer:5/8

5 If P (a) = 3/8, P(b) = 1/2 and P(A∩B) = 1/4 then

A 1/4

B 1/3

C 3/4

D 3/8

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Answer:1/3

6 If P(a) = 0,4, P(b) = 0.8 and P(B|A) = 0.6 then P(A∪B) is equal to

A 0.24

B 0.3

C 0.48

D 0.96

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Answer:0.96

7 If P(a) = 7/10 P(b) = 7/10 and P(A∪B) = 7/10 then P (B|A) + P(A|B) equals

A 1/4

B 1/3

C 5/12

D 7/12

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Answer:7/12

8 An urn contain’s balls of which 3 are red, 4 are blue and 2 are green, 3 balls are drawn at random without replacement from the urn. The probability that the 3 balls haye different colours is

A 1/3

B 2/7

C 1/21

D 2/23

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Answer:2/7

9 The mean and the variance of binomial distribution are 4 and 2, respectively. Then the probability of 2 success

A 128/256

B 219/256

C 7/64

D 28/256

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Answer:7/64

10 The probability of India w inning a test match against. West Indies is 1/2. Assuming independence from match to match the probability that in a match series India second win occurs at the third test is)

A 1/6

B 1/4

C 1/2

D 2/3

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