Online Test — Probability
10 Questions • 20 min • Chapter MCQ
20:00
Question 1 of 10
easy
A die is rolled. Probability of getting neither 1 nor 6 is:
1/3
2/3
1/2
5/6
Explanation: Favourable outcomes are 2,3,4,5 giving 4/6=2/3.
Question 2 of 10
medium
Three coins are tossed. Number of outcomes in the sample space is:
6
8
9
12
Explanation: 2³ = 8 outcomes.
Question 3 of 10
medium
A bag contains 4 red, 5 blue and 1 green ball. Probability of not choosing green is:
1/10
9/10
4/5
3/5
Explanation: Only 1 green among 10 balls. Complement gives 9/10.
Question 4 of 10
easy
Probability of getting a prime number on a die is:
1/2
1/3
2/3
1/6
Explanation: Prime numbers are 2,3,5. Hence 3/6 = 1/2.
Question 5 of 10
easy
If P(A)=0.35, then P(A') equals:
0.35
0.65
1.35
0
Explanation: P(A') = 1 − P(A) = 0.65.
Question 6 of 10
easy
A number is chosen from 1 to 10. Probability it is a multiple of 3 is:
1/5
3/10
2/5
1/2
Explanation: Multiples are 3,6,9. Hence 3/10.
Question 7 of 10
easy
When two dice are thrown, what is the probability of getting a doublet?
1/6
1/3
1/12
1/9
Explanation: Doublets are (1,1), (2,2), (3,3), (4,4), (5,5), (6,6). Total 6 outcomes. Probability = 6/36 = 1/6.
Question 8 of 10
medium
A number is selected from 1 to 20. Probability it is divisible by 4 is:
1/5
1/4
3/10
2/5
Explanation: Multiples are 4,8,12,16,20. Hence 5/20=1/4.
Question 9 of 10
medium
If P(A)=0.6 and P(B)=0.5 and P(A∩B)=0.2, then P(A∪B)=?
0.9
1.1
0.8
0.3
Explanation: P(A∪B)=0.6+0.5−0.2=0.9.
Question 10 of 10
medium
Sachin uploads two study videos. The probability the Matrices video gets over 1000 views is 0.8, and the Probability video is 0.6. Assuming these are independent, what is the probability BOTH get over 1000 views?
0.2
0.48
1.4
0.92
Explanation: For independent events, P(A ∩ B) = P(A) × P(B) = 0.8 × 0.6 = 0.48.