Correct Answer: 10 21
Explanation:
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 & Comments