(A) To find the $HCF$ of $6$ and $20$,we first find the prime factorization of each number:$6 = 2 \times 3$$20 = 2^2 \times 5$The $HCF$ is the product

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(A) To find the $HCF$ of $6$ and $20$,we first find the prime factorization of each number:$6 = 2 \times 3$$20 = 2^2 \times 5$The $HCF$ is the product of the smallest power of each common prime factor.The only common prime factor is $2$,and its smallest power is $2^1 = 2$.Therefore,the $HCF$ of $6$ and $20$ is $2$.