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Welcome to MSE. It will be more likely that you will get an answer if you show us that you made an effort. – José Carlos Santos Oct 24 '17 at 15:20
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Let X1,X2,....Xn be i.i.d. from a distribution function F which is concentrated on three mass points a, b and c with respective probability masses pa, pb and pc (where pa + pb + pc = 1). Then show sup|Fn(x)-F(x)|=op(1) where the Fn(x) is the empirical distribution – Yanwen FANG Oct 24 '17 at 15:22