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Q.

Find the greatest common factor of 42, 126 and 210.


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a

2

b

6

c

14

d

42 

answer is D.

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Detailed Solution

Concept- Greatest common factor is nothing but HCF.
It is the greatest number that divides two or more numbers.
To know HCF of any numbers we must first know their factors.
Factors of 42:
Question ImageFactors of 126:
Question ImageFactors of 210:
Question ImageThe common factor in all the three numbers is 2, 3 and 7.
Question ImageHence, the correct answer is option 4.
 
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