Aptitude - Probability - Discussion
Discussion Forum : Probability - General Questions (Q.No. 12)
12.
A bag contains 4 white, 5 red and 6 blue balls. Three balls are drawn at random from the bag. The probability that all of them are red, is:
Answer: Option
Explanation:
Let S be the sample space.
| Then, n(S) | = number of ways of drawing 3 balls out of 15 | |||
| = 15C3 | ||||
|
||||
| = 455. |
Let E = event of getting all the 3 red balls.
 n(E) = 5C3 = 5C2 = |
(5 x 4) | = 10. |
| (2 x 1) |
| P(E) = |
n(E) | = | 10 | = | 2 | . |
| n(S) | 455 | 91 |
Discussion:
33 comments Page 2 of 4.
Akanksha said:
7 years ago
A box contains 6000 cards numbered 1 to 6000. One card is drawn at random from the box. Find the probability that the number is neither divisible by 4 nor 6? Please give me a solution.
(1)
Sinchana said:
6 years ago
If the answer is 0.02 something how we can convert please explain it now.
(1)
Jino said:
5 years ago
@Deki Zangmo.
Thanks for the clear and best explanation.
Thanks for the clear and best explanation.
(1)
Subash said:
6 years ago
Can any one explain clearly.
Pavanmahesh said:
6 years ago
All of them red balls means why it can be a 15c3?
Chetan said:
9 years ago
Good explanation, Thanks @Rohit.
Somya said:
9 years ago
While calculating the term for red balls, why did we not consider the blue balls?
Adu said:
9 years ago
Thanks all.
Divya said:
2 decades ago
How come 5C3 become 5C2? please explain.
Pandu raju said:
9 years ago
Thank you for the explanation.
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