题目内容
（请给出正确答案）
[单选题]
How many hours a week do you spend on your hobby？
A.a third
B.every-day
C.four hours
D.at once
提问人：网友wind_leaf
发布时间：2022-01-07
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Suppose the joint pdf of random variables
and
is
Then
and
are independent if and only if
.
题目内容
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