A. 18/35
B. 12/35
C. 17/35
D. 19/35
Explanation:
If both agree stating the same fact, either both of them speak truth of both speak false.
Probability = 3/5 * 4/7 + 2/5 * 3/7
= 12/35 + 6/35 = 18/35
Related Mcqs:
- The probability of a lottery ticket being a prized ticket is 0.2. When 4 tickets are purchased, the probability of winning a prize on at least one ticket is__________?
A. 0.4869
B. 0.5904
C. 0.6234
D. 0.5834 - Out of first 20 natural numbers, one number is selected at random. The probability that it is either an even number or a prime number is_____________?
A. 1/2
B. 16/19
C. 4/5
D. 17/20 - If four coins are tossed, the probability of getting two heads and two tails is__________?
A. 3/8
B. 6/11
C. 2/5
D. 4/5 - Three 6 faced dice are thrown together. The probability that all the three show the same number on them is -.
A. 1/216
B. 1/36
C. 5/9
D. 5/12 - Three 6 faced dice are thrown together. The probability that no two dice show the same number on them is__________?
A. 7/12
B. 5/9
C. 1/36
D. 5/12 - A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If three marbles are picked at random, what is the probability that they are all blue?
A. 1/455
B. 2/455
C. 1/91
D. 4/455 - A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If two marbles are picked at random, what is the probability that they are either blue or yellow?
A. 3/22
B. 4/21
C. 2/21
D. 1/14 - In a party there are 5 couples. Out of them 5 people are chosen at random. Find the probability that there are at the least two couples?
A. 5/21
B. 5/14
C. 9/14
D. 16/21 - Out of 10 persons working on a project, 4 are graduates. If 3 are selected, what is the probability that there is at least one graduate among them?
A. 1/6
B. 5/8
C. 3/8
D. 5/6 - If a dice is rolled twice then what is the probability that the sum of the number of dots shown is 8?
A. 5/36
B. 4/36
C. 1/12
D. 1/2
