Sets
4 marks · NormalLet and .
(a)[2 marks]
List all the elements in .
(b)[1 mark]
List all the elements in .
(c)[1 mark]
List all the elements in , if the universal set is .
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Show answer
(a) {r, s, t, u, v}
(b) {t}
(c) {r, v, w}
Show mark scheme and worked solution
Marking points
M1 (a) · 1 mark · Lists elements for union correctly, even if not fully accurate.
A1 (a) · 1 mark · All five correct elements, no extras.
B1 (b) · 1 mark · Gives {t} only.
B1 (c) · 1 mark · Gives {r, v, w}.
Worked solution
(a) G = {s, t, u}, H = {r, t, v}; union: r, s, t, u, v.
(b) Intersection: the only common element is t.
(c) Universal: r, s, t, u, v, w; remove G: leaving r, v, w.