Which of the following will not give a composite number?

1 × 12

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2 × 7

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19 × 1

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13 × 3

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Solution

The correct option is C 19 × 1
1 × 12 = 12
Factors: 1, 2, 3, 4, 6 and 12

2 × 7 = 14
Factors: 1, 2, 7 and 14

19 × 1 = 19
Factors: 1 and 19
This is prime number as it has only two factors: 1 and the the number itself

13 × 3 = 39
Factors: 1, 3, 13 and 39

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