2.2
(i) S={(r,r,r),(r,r,b),(r,r,g),(r,b,r),(r,b,b),(r,b,g),(r,g,r),(r,g,b),(r,g,g),(b,r,r),(b,r,b),(b,r,g),(b,b,r),(b,b,b),(b,b,g),(b,g,r),(b,g,b),(b,g,g),(g,r,r),(g,r,b),(g,r,g),(g,b,r),(g,b,b),(g,b,g),(g,g,r),(g,g,b),(g,g,g)}.
(ii) A={(r,b,g),(r,g,b),(b,r,g),(b,g,r),(g,r,b),(g,b,r)},B={(r,r,b),(r,r,g),(r,b,r),(r,b,b),(r,g,r),(r,g,g),(b,r,r),(b,r,b),(b,b,r),(b,b,g),(b,g,b),(b,g,g),(g,r,r),(g,r,g),(g,b,b),(g,b,g),(g,g,r),(g,g,b)},C=A∪B=S−{(r,r,r),(b,b,b),(g,g,g)}.
2.4
(i) Denoting by ...
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