Probability and sample spaces
Probability and inference · Stage 2
Recognize the pattern
Probability is favorable outcomes divided by all equally likely outcomes.
Useful ruleP=favorable/total
Try it before reading the solution
A bag has 3 red and 2 blue marbles. Find P(red).
This teaching example is original and is not an official SAT question.
Reasoning
There are 3 red marbles out of 5 total.
Answer3/5
03 · Next step
See membership →Ready for adaptive practice
Practice questions remain in English, as on the SAT.