$$\(4 \quad B=\{\mathrm{b}, \mathrm{l}, \mathrm{u}, \mathrm{e}\}\)$$ $$\(G=\{\mathrm{g}, \mathrm{r}, \mathrm{e}, \mathrm{y}\}\)$$ $$\(W=\{\mathrm{w}, \mathrm{h}, \mathrm{i}, \mathrm{t}, \mathrm{e}\}\)$$ (a) List all the members of the set (i) $$\(B \cup G\)$$ (ii) $$\(W \cap G^{\prime}\)$$ (2) Serena writes down the statement $$\(B \cap G \cap W=\varnothing\)$$ (b) Is Serena's statement correct? You must give a reason for your answer. (1)

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