1 hour MATHEMATICS
[60 marks]
Answer four questions in all. All questions carry equal marks.
h
(a)
If
U = {x CN; xẤ20}
A = {x: 1<x<10, where x is a composite number} B= {prime factors of 40},
C = {x: 1<x< 20, where x is a square number}
(i)
List the member of
a. A'UB
B. (A n B!) u C!
Y. (AluC)
8. U
(
ii)
Prove that union (u) is associative with respect to set A, B and C.
O