Answer:
Step-by-step explanation:
(a).
Multiples of 4 are {4, 8, <em>12,</em> 16, 20, <em>24,</em> 28, ..... }
Multiples of 6 are {6, <em>12,</em> 18, <em>24,</em> 30, ..... }
12 and 24
(b).
Multiples of 6 are {6, 12, <em>18</em>, 24, 30, <em>36</em>, 42, ..... }
Multiples of 9 are {9, <em>18</em>, 27, <em>36</em>, 45, ..... }
18 and 36