Aptitude - Probability - Discussion
Discussion Forum : Probability - General Questions (Q.No. 1)
1.
Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 5?
Answer: Option
Explanation:
Here, S = {1, 2, 3, 4, ...., 19, 20}.
Let E = event of getting a multiple of 3 or 5 = {3, 6 , 9, 12, 15, 18, 5, 10, 20}.
 P(E) = |
n(E) | = | 9 | . |
| n(S) | 20 |
Discussion:
107 comments Page 6 of 11.
Sagar Valecha Soni said:
1 decade ago
Ya 9/20 is correct I am agree from this answer.
Garima said:
10 years ago
According to me the answer should be 1/2.
Multiples of 3 and 5. (1, 3, 5, 6, 9, 10, 12, 15, 18, 20).
Please let me know where am I wrong?
Multiples of 3 and 5. (1, 3, 5, 6, 9, 10, 12, 15, 18, 20).
Please let me know where am I wrong?
Divya said:
10 years ago
How to cal multiple of larger number?
Can any one give a answer for this?
Ex: Same question number is 1-300.
Can any one give a answer for this?
Ex: Same question number is 1-300.
Samuel said:
10 years ago
@Divya.
Factorize or divide it.
Factorize or divide it.
Rutu said:
9 years ago
Why s=20 selected? please give me answer.
Mahesh said:
9 years ago
What's, and what is e please explain?
Shailendra rathore said:
9 years ago
9/20 is the right answer, and thanks for explaining the answer in different ways.
Saurav said:
9 years ago
As both the events A and B are independent and non-mutually exclusive we can use the following formula:.
P (A or B) = P (A) + P (B) - P (A and B).
= 6/20 + 4/20 - (6/20 * 4/20) [probability intersection rule for dependent events].
= 10/20 - 3/50.
= 50 - 6/100.
= 44/100 = 11/25. But this answer is not in the option.
P (A or B) = P (A) + P (B) - P (A and B).
= 6/20 + 4/20 - (6/20 * 4/20) [probability intersection rule for dependent events].
= 10/20 - 3/50.
= 50 - 6/100.
= 44/100 = 11/25. But this answer is not in the option.
Rani said:
9 years ago
Where this 5 gone in the event?
Mani said:
9 years ago
Where this 6 gone in the event?
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers