ξ = { x : x ialah integer 10 ≤ x < 25 } - {10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24}, ξ = { x : x ialah integer 10 ≤ x ≤ 25 } - {10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25}, A = { gandaan 4 kurang daripada 25 } - {4, 8, 12, 16, 20, 24}, B = { nombor genap kurang daripada 25 } - {2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24}, C = { nombor kuasa dua sempurna kurang daripada 30 } - {4, 9, 16, 25}, D = { faktor perdana bagi 40 } - { 2, 5}, E = { nombor perdana kurang daripada 20 } - { 2, 3, 5, 7, 11, 13, 17, 19 }, F = { faktor bagi 64 } - { 1, 2, 4, 8, 16, 32, 64 },

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