A certain experiment has three possible outcomes. The outcomes ar

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A certain experiment has three possible outcomes. The outcomes are mutually exclusive and have probabilities p, $$\frac{p}{2}$$ , and $$\frac{p}{4}$$ , respectively. What is the value of p ?

A、$$\frac{1}{7}$$
B、$$\frac{2}{7}$$
C、$$\frac{3}{7}$$
D、$$\frac{4}{7}$$
E、$$\frac{5}{7}$$

答案：D

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