NCERT Solutions for class 12 Maths | Chapter 13 - Probability
Questions
1
If P(x) = 2/15; y = 1, 2, 3, 4, 5, 0 otherwise then P|x = 1 or 2| is
Answer:1/5
2
If one card is drawn out of 52 playing cards, the probability that it is an dice is
Answer:1/13
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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
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
Answer:5/8
6
If P(a) = 0,4, P(b) = 0.8 and P(B|A) = 0.6 then P(A∪B) is equal to
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
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
Answer:2/7
9
The mean and the variance of binomial distribution are 4 and 2, respectively. Then the probability of 2 success
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)
Answer:1/4
11
Five horse are in a race. Mr. A select two of the horses at random and best on them. The probability that Mr. A select the winning horses is
Answer:2/5
then
15
The probability of an event is 3/7. Then odd against the event is
Answer:4 : 3
16
Let A and B two event such that P(a) = 3/8, P(b) = 5/8 and P(A∪B) = 3/4. Then P(A|B).P(A’|B) is equal to
Answer:6/25
18
If A and B are two independent events, then
A
P(A∩B) = P(a) × P(b)
B
P(AB) = 1 – P(A’) P(B’)
C
P(AB) = 1 + P (A’) P(B’) P(A’)
D
Answer:P(A∩B) = P(a) × P(b)
20
Three distinct numbers.are selected from First 100 natural numbers. The probability divisible by 2 and 3 is
Answer:4/1155
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