Question

10. Two dice are thrown. What is the probability of obtaining a total of 10 or 11?
11. A box contains 12 balls out of which x are black. if one ball is drawn at random from the box what is the probability that it will be a black ball? If 6 more black balls are put in the box, the probability of drawing a black ball is now double of what it was before. Find x.

Answer 1

1. 5 by 36 is the probablityof obtaining 10 or 11
2. 1 by 12 and 1 by 18