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

2

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6

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14

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21

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42

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Solution

The correct option is E $42$
We know, $42 = 2 \times 3 \times 7$
$126 = 2 \times 3 \times 3 \times 7$
$210 = 2 \times 3 \times 5 \times 7$
$∴$ H.C.F $= 2 \times 3 \times 7 = 42$

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