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Four students, Rick, Robin, Ryu, and Roy

are registered for the same class and attend inde
pendently of one
another, Rick 96.5% of the time, Robin 93.3% of the time, Ryu
8
8.2
% of the time,
and
Roy
77.9
% of the time.
What is the probability that on any given day
a)
at least three of them will be in class?
b)
none of them will be in class?

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