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Question

Find all the even common factors of 16 and 20.


Your Answer
A
1, 2 and 4
Your Answer
B
2 and 6
Your Answer
C
4 and 5
Correct Answer
D
2 and 4 

Solution

The correct option is D 2 and 4 
16 = 1 × 16
    = 2 × 8
    = 4 × 4
Factors of 16: 1, 2, 4, 8 and 16

20 = 1 × 20
     = 2 × 10
     = 4 × 5
Factors of 20: 1, 2, 4, 5, 10 and 20

Common factors are 1, 2 and 4.
Out of which even factors are 2 and 4.

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