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Hi,
Great! on showing the Sums..will leave reducing Up to You
NO PARTICLES PARTICLES TOTAL
Good 320 14 334
bad 80 36 116
400 50 450
Suppose that a wafer is selected at random.What is the probability that the wafer is
a.is good 334/450
b.has no particles 400/450
c.is good and has no particles 320/450
d.is good or has no particles 334/450 + 400/450 - 320/450
e.is good given that it has no particles 
f.has no particles,given that its good