Probability of one colour or another
Add the counts for the two colours, then write the total over all the marbles.
Loading a question…
You've done today's 10 free questions.
Come back tomorrow for 10 more, or get unlimited practice with a membership.
Want more today? Print 20 more questions free, with the answers.
Already a member? Sign in.
See worked examples
A bag has 8 red, 1 blue, 1 green and 5 yellow marbles. One marble is picked at random. What is the probability that it is blue or red? Write a fraction in lowest terms.
Answer: 3/5
A bag has 9 red, 8 blue, 5 green and 4 yellow marbles. One marble is picked at random. What is the probability that it is yellow or red? Write a fraction in lowest terms.
Answer: 1/2
A bag has 8 red, 1 blue, 4 green and 4 yellow marbles. One marble is picked at random. What is the probability that it is green or blue? Write a fraction in lowest terms.
Answer: 5/17
Tip: Add the counts for the two colours, then write the total over all the marbles.
Print a worksheet of this skill New questions and an answer key, free.
Up next
- Next in this topic Probability of two draws without replacement Class 7
Print a free worksheet with answers (20 questions).
Learn it hands-on
- Is It Fair? Chance and Probability Grades 6–7 · printable lessons
Practise without limits
Members practise as much as they like, every day, and get the printable packs and lessons too.