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1. $4 (x + y), 10 (x - y), 12 (x^{2} - y^{2})$

Answer: Option C

Explanation:

১ম রাশি=4 (a + b) =2×2 (a + b) ২য় রাশি=10 (a - b) =2×5 (a - b) ৩য় রাশি=12 (a^{2} - b^{2}) =2×3×2 (a + b) (a - b) ∴ নির্ণেয় গ.সা.গু=2

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