Maths 12th cbse

 Question1:

Two dice are throne if it is known that sum of numbers of the dice was less than 6 the probability of getting a sum 3 is

ANS: 1/5

 Question2:

 It is give that the events A and B are such that P(A)=1/4,P(B/A)=2/3. Then ,P(B) is:

ANS: 1/3

 Question3:

If P(A)=4/5,and P(A inintersectionB)=7/10, then P(B/A) is equal to:

ANS: 7/8

 Question4:

 If P(A) = 0.4, P(B) = 0.8 and P(B /A)=0.6, then P(A U B) is equal to:

ANS: 0.96

 Question5:

 Let A and B be two events. If P(B) = 0.4, P(A U B) = 0.7, then P(A / B) is equal to :

ANS: 0

 Question6:

Let A and B be two events such that P(A ' / B ' ( equals

ANS: 3/8

 Question7:

 Five horses are in a race. Mr. A selected two of the horses at random and bets on them. The probability that Mr. A selected the winning horse is :

ANS: 2/5

 Question8:

 If A and B are two independent events, then P(Ā/B ' ) is equal to :

ANS: 1 - P(A)

 Question9:

 An urn contains 10 black and 5 white balls. If two balls are drawn one by one without replacing the ball, then the probability of getting both black balls is :

ANS: 3/7

 Question10:

An unbiased die is tossed twice. The probability of getting a 4, 5 or 6 on the first toss and a 1, 2, 3 or 4 on the second toss is :

ANS: 1/3