Mathematics for IGCSE & O level - Probability (Section 8 - No. 40)
A bag contains 4 green balls and 1 blue ball. What is the probability of picking two green balls if the first ball is replaced?
16/25
4/25
4/5
8/25
คำอธิบาย
Probability of green is 4/5. With replacement, both picks have a 4/5 chance: (4/5)*(4/5) = 16/25