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A and B are independent events, and the probability that both events occur is $$\frac{1}{2}$$. Which of the following could be the probability that event A occurs? Indicate all such probabilities.
A、$$\frac{1}{4}$$
B、$$\frac{1}{2}$$
C、$$\frac{3}{4}$$
D、1
E、0
答案：C,D,E
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