Mtahs : Probability

1. A bag contains 2 yellow, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?

A. 1/2
B. 10/21
C. 8/11
D. 14/21

Answer : Option B

2. Three coins are tossed. What is the probability of getting at most two head?

A. 7/8
B. 1/8
C. 1/2
D. 1/7

Answer : A

3. A die is rolled twice. What is the probability of getting a sum equal to 9?

A. 2/3
B. 2/9
C. 1/9
D. 1/6

Answer : C


4) 5 coins are tossed together. What is the probability of getting exactly 2 tails?

A. 1/2
B. 2/5
C. 4/11
D. 5/16


5). Ramesh and Suresh go for an interview for two vacancies. The probability for the selection of Ramesh is 1/5 and whereas the probability for the selection of Suresh is 1/6. What is the probability that none of them are selected?

A) 2/3
B) 1/30
C) 1/3
D) 29/30

Answer : A


6). Ramesh and Suresh go for an interview for two vacancies. The probability for the selection of Ramesh is 1/5 and whereas the probability for the selection of Suresh is 1/7. What is the probability that only one of them is selected ?

A) 2/35
B) 2/7
C) 1/35
D) 5/7

Answer : B





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