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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
  2 is a prime number
 3 is a prime number
  6 is a composite number
Hence answers are 2 & 3

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