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1. $a^{2} - 3 a, a^{2} - 9, a^{2} - 4 a + 3$

Answer: Option B

Explanation:

a²-3a=a(a-3)
a²-9=(a+3)(a-3)
a²-4a+3
=a²-3a-a+3
=a(a-3)-1(a-3)
=(a-1)(a-3)
Therefore, HCM=a-3
(ans)

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