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Q.

Which of the following is a composite number?

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a

2

b

1

c

9

d

5

answer is D.

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Detailed Solution

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A prime number is a number with exactly two factors that are 1 and the number itself. 

In case of 9 there are three factors i.e., 3 × 3 × 1. Hence, it is not a prime number. Natual numbers (except 1) which are not prime are called composite numbers. 

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