Which one of the following is an odd composite number?

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answer is B.

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Detailed Solution

1)     When we divide 7 by 2, it gives the remainder as 1. So, 7 is an odd number. The factors of 7 are just 7 and 1. So, that is not a composite number. Hence 7 is not an odd composite number.
2)     When we divide 9 by 2, it gives the remainder as 1. So, 9 is an odd number. The factors of 9 are 1,3, and 9. So, that is a composite number. Hence 9 is an odd composite number.
3)     When we divide 11 by 2, it gives the remainder as 1. So, 11 is an odd number. The factors of 11 are just 11 and 1. So, that is not a composite number. Hence 11 is not an odd composite number.
4)     When we divide 12 by 2, it gives the remainder as 0. So, 12 is not an odd number. The factors of 12 are 1,2,3,4,6 and 12. So, that is a composite number. Hence 12 is not an odd composite number.
Hence, Option (2) is the correct answer.

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