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The HCF of 42, 63 and 105 is:
7
630
63
21
42 = $$ 2 \times 3 \times 7$$
63 =Â $$ 3 \times 3 \times 7$$
105 =Â $$ 3 \times 5 \times 7$$
Taking the common factors, the HCF would be 21.
So , the answer would be option d)21.
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