Aptitude - Probability - Discussion
Discussion Forum : Probability - General Questions (Q.No. 2)
2.
A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?
Answer: Option
Explanation:
Total number of balls = (2 + 3 + 2) = 7.
Let S be the sample space.
| Then, n(S) | = Number of ways of drawing 2 balls out of 7 | |||
| = 7C2 ` | ||||
|
||||
| = 21. |
Let E = Event of drawing 2 balls, none of which is blue.
 n(E) |
= Number of ways of drawing 2 balls out of (2 + 3) balls. | |||
| = 5C2 | ||||
|
||||
| = 10. |
| P(E) = |
n(E) | = | 10 | . |
| n(S) | 21 |
Discussion:
116 comments Page 11 of 12.
Pragya said:
7 years ago
C2 stands for what? Please explain me.
Malik Ahamed said:
1 year ago
Where did 6 came from? Please explain.
(3)
Soundar said:
2 decades ago
Its a correct answer and short way.
Jay said:
1 decade ago
(7 x 6)
(2 x 1)
Please explan it.
(2 x 1)
Please explan it.
Navcool said:
1 decade ago
Is it with or without replacement?
Summi said:
6 years ago
How come 7*6/2*1? please clear me.
Kenneth said:
10 years ago
Please clear me on how 6 come in?
Suyash said:
8 years ago
Simply, say 5/7 * 4/6.
= 10/21.
= 10/21.
Arnika said:
7 years ago
What is C and S please explain?
HEMALATHA said:
6 years ago
@Pranav.
The answer is 62.
The answer is 62.
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