The integers 1 through 15 are written on separate cards. You are asked to pick a card at random. What is the probability that you pick a prime number?
2/5
A child is throwing darts at the board shown in the figure. The radii of the circles on the board are 3 cm, 6 cm and 9 cm respectively. What is the probability that the child's dart lands in the red circle, given that it hits the board?
1/9
Two dice are rolled together. What is the probability of obtaining a sum less than 6?
5/18
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