Question

Let X = {a, e, i, o, u} and Y = {a, i, k, u}. Find X - Y and Y - X​

Answer 1

Answer:

E[(X−EX)(Y−EY)] =E[XY−X(EY)−(EX)Y+(EX)(EY)] =E[XY]−(EX)(EY)−(EX)(EY)+(EX)(EY) =E[XY]−(EX)(EY).

Answer 2

Answer:

x-y={e, o, u}

y-x={k}

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