Correct option is A
Given: Highest Common Factor of 8, 9 and 12
Let’s check:
8 → 1, 2, 4, 8
9 → 1, 3, 9
12 → 1, 2, 3, 4, 6, 12
The only number that goes into all three is 1.
So, highest common factor is 1.
Thus, correct option is (a).
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