Probability of a simple event: bags of marbles

Probability = number of favourable outcomes ÷ total outcomes. Write a fraction in lowest terms.

1. A bag has 3 red and 1 blue marbles. One marble is picked at random. What is the probability that it is blue? Write a fraction in lowest terms.
2. A bag has 1 red and 2 blue marbles. One marble is picked at random. What is the probability that it is red? Write a fraction in lowest terms.
3. A bag has 3 red and 8 blue marbles. One marble is picked at random. What is the probability that it is red? Write a fraction in lowest terms.
4. A bag has 2 red and 2 blue marbles. One marble is picked at random. What is the probability that it is blue? Write a fraction in lowest terms.
5. A bag has 8 red, 3 blue and 8 green marbles. One marble is picked at random. What is the probability that it is red? Write a fraction in lowest terms.
6. A bag has 2 red, 5 blue and 7 green marbles. One marble is picked at random. What is the probability that it is blue? Write a fraction in lowest terms.
7. A bag has 8 red, 9 blue and 5 green marbles. One marble is picked at random. What is the probability that it is blue? Write a fraction in lowest terms.
8. A bag has 2 red, 7 blue and 6 green marbles. One marble is picked at random. What is the probability that it is red? Write a fraction in lowest terms.
9. A bag has 12 red, 3 blue and 7 green marbles. One marble is picked at random. What is the probability that it is green? Write a fraction in lowest terms.
10. A bag has 8 red, 6 blue and 4 green marbles. One marble is picked at random. What is the probability that it is blue? Write a fraction in lowest terms.
11. A bag has 3 red, 11 blue and 2 green marbles. One marble is picked at random. What is the probability that it is green? Write a fraction in lowest terms.
12. A bag has 6 red, 8 blue and 6 green marbles. One marble is picked at random. What is the probability that it is red? Write a fraction in lowest terms.
13. A bag has 15 red, 1 blue, 13 green and 8 yellow marbles. One marble is picked at random. What is the probability that it is yellow? Write a fraction in lowest terms.
14. A bag has 10 red, 10 blue, 11 green and 8 yellow marbles. One marble is picked at random. What is the probability that it is red? Write a fraction in lowest terms.
15. A bag has 12 red, 12 blue, 8 green and 6 yellow marbles. One marble is picked at random. What is the probability that it is yellow? Write a fraction in lowest terms.
16. A bag has 3 red, 10 blue, 12 green and 9 yellow marbles. One marble is picked at random. What is the probability that it is yellow? Write a fraction in lowest terms.
17. A bag has 14 red, 5 blue, 11 green, 15 yellow and 13 white marbles. One marble is picked at random. What is the probability that it is green? Write a fraction in lowest terms.
18. A bag has 15 red, 11 blue, 7 green, 18 yellow and 20 white marbles. One marble is picked at random. What is the probability that it is red? Write a fraction in lowest terms.
19. A bag has 4 red, 17 blue, 3 green, 11 yellow and 20 white marbles. One marble is picked at random. What is the probability that it is blue? Write a fraction in lowest terms.
20. A bag has 12 red, 18 blue, 18 green, 12 yellow and 14 white marbles. One marble is picked at random. What is the probability that it is blue? Write a fraction in lowest terms.