Question 7

The HCF of 42, 63 and 105 is:

Solution
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42 = $$ 2 \times 3 \times 7$$

63 = $$ 3 \times 3 \times 7$$

105 =  $$ 3 \times 5 \times 7$$

Taking the common factors, the HCF would be 21.

So , the answer would be option d)21.

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