The HCF of 12 and 18 is
A3
B2
C6
D9
Answer & Solution
Correct answer: C. 6
1. $12 = 2^2 \times 3$ and $18 = 2 \times 3^2$.
2. HCF = product of the lowest powers of common primes = $2^1 \times 3^1 = 6$.
3. So the HCF is 6.
_Source: Karnataka SSLC (KSEEB) Class 10 Mathematics, Ch8 'Real Numbers', §8.3_
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