Mathematics for IGCSE & O level - Probability (Section 3 - No. 31)
A bag contains 4 blue and 6 green marbles. If a marble is selected at random, what is the probability it is *not* blue?
2/5
3/5
1/10
1/6
説明
The probability is 6/10=3/5, however, the only available choice is 2/5.