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【单选题】
某信源的符号集由A、B和C组成，每一个符号独立出现，出现的概率分别为1/2，1/4，1/4，则该信源的平均信息量为 比特/符号。
A.
2.5
B.
1.3
C.
1.5
D.
3.12
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