Probability Addition Rule

12 0 by Muthulakshimi

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Understand the Addition Rule in probability with multiple-choice questions designed to strengthen skills in calculating combined event probabilities.

Category Education

1 - Multiple Choice

What is the addition rule formula for two events A and B?

1. P(A and B) = P(A) + P(B)
2. P(A or B) = P(A) + P(B)
3. P(A or B) = P(A) + P(B) − P(A and B)
4. P(A or B) = P(A) × P(B)

2 - Multiple Choice

A card is drawn from a deck. What is the probability of drawing a heart or a queen?

1. 1/13
2. 4/52
3. 16/52
4. 17/52

3 - Multiple Choice

If P(A) = 0.4, P(B) = 0.3, and P(A and B) = 0.1, what is P(A or B)?

1. 0.7
2. 0.8
3. 0.6
4. 0.9

4 - Multiple Choice

What is the probability of rolling a 3 or a 4 on a fair six-sided die?

1. 1/6
2. 1/3
3. 1/2
4. 2/6

5 - Multiple Choice

Two events A and B are mutually exclusive. What is P(A or B)?

1. P(A) − P(B)
2. P(A) × P(B)
3. P(A) + P(B)
4. P(A) + P(B) − P(A and B)

6 - Multiple Choice

In a bag of 10 red and 15 blue marbles, what is the probability of drawing a red or blue marble?

1. 10/25
2. 1
3. 15/25

7 - Multiple Choice

If P(A) = 0.5 and P(B) = 0.2 and events are independent, what is P(A or B)?

1. 0.7
2. 0.6
3. 0.9
4. 0.4

8 - Multiple Choice

What is the probability of rolling a 3 or 4 on a die?

1. 1/3
2. 1/6
3. 1/2
4. 2/6

9 - Multiple Choice

If events A and B are not mutually exclusive, you must:

1. Multiply probabilities
2. Subtract P(A and B)
3. Ignore overlap
4. Add directly

10 - Multiple Choice

A number is picked from 1 to 10. What is P(even or a multiple of 3)?

1. 7/10
2. 6/10
3. 5/10
4. 4/10

11 - Multiple Choice

In a class, 20 like math, 15 like science, and 5 like both. What is P(math or science)?

1. 35
2. 30
3. 25
4. 20

12 - Multiple Choice

Which pair of events is mutually exclusive?

1. Rolling a 2 or a 5
2. Being a student and a teacher
3. Drawing a king or a red card
4. Eating and drinking

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