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Question

$1 - a^{2} + 2 a b - b^{2}$ এর উৎপাদক কোনটি?

(1+a – b)(1 - a + b)

(1+a+b) (1 - a + b)

(1+a+b) (1 - a - b)

(1 - a + b) (1 - a - b)

ANS : 1

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