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Q.

31 is a ___ number.

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a

Composite

b

Co-prime

c

Prime 

d

Unique

answer is D.

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Detailed Solution

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A number greater than 1, having only two factors namely 1 and the number itself, is called a prime number.

31 can be expressed as:

31 = 1 x 31

Therefore, only 1 and 31 are the factors of 31.

Hence we can say that 31 is a prime number.

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