Mathematics for IGCSE & O level - Probability (Section 1 - No. 7)
A bag contains 8 green balls and 2 white balls. Two balls are selected without replacement. Which is/are the correct approach(es) to find the probability of selecting two balls of different colors?
Draw a tree diagram to illustrate the possible outcomes and their probabilities.
Calculate the probability of selecting a green ball first and then a white ball.
Calculate the probability of selecting a white ball first and then a green ball.
Multiply the probabilities of each selection independently.
Giải thích
When events are dependent, a tree diagram is suitable. To find different colors, determine P(green then white) and P(white then green).