求这题数学题怎么做 50
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a,bothe the husband and wife watch the show is 0.4*0.5=0.2
b,the husband watches the show given that his wife watches it is 0.5*0.7=0.35
b,the husband watches the show given that his wife watches it is 0.5*0.7=0.35
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a,是0.4
b,是0.35
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