8.The prime factors of 12 are *
1 point
2 x 2 x 2
2 x 2 x 3
2 x 2 x2 x 2
9.What is missing in 5 . 10, 15, ----, 25 *
1 point
20
30
40
10.The following are multiples of 3 except *
1 point
12
13
15
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