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Q.

The prime factors of 42 are

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a

2

b

3

c

6

d

Both A and B

answer is D.

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Detailed Solution

The factors of 42 are 1,2,3,6,7,21,42

Prime factors are 2,3,7

Option (A): 2 is a prime number

Option (B): 3 is  a prime number

Option (C): 6 is a composite number

Hence answer is D

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