CUET Preparation Today
A bag contains 6 white and 4 black ball. Two balls are drawn at random. Then the probability of getting balls of the same colour is ____. |
8/15 6/15 6/13 7/15 |
7/15 |
| Explanation: We are given 6 white and 4 black balls and we have been asked to find the probability of drawing 2 balls of the same colour. Number of ways of drawing 2 balls out of 10. 2 balls can be drawn out of 10 balls in the following number of ways – 10C2 = 45 Total outcomes are 45. Favourable items = n(2 white balls appear) + n(2 black balls appear) Favourable items = 6C2+4C2 = 15 + 6 = 21 Required Probability = 21/45 = 7/15 The correct answer is Option (4) → 715 |
