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PX(x= head)

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f(x) r w

EX(x) = p (r) + (1 p)(w) =w+ p(r w) EX(x) = r f(x) x0

w+p(r w) = r f(x)

p= 1f(x0)

r w

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Wetgrass

Raining Sunnyday

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