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1. $a^{2} - b^{2}$

Answer: Option D

Explanation:

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

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