plzz ans with steps wrong answer will be reported
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(a+b)(a²-ab+b²+1)
=(a+b)a² -ab(a+b) + b²(a+b) +(a+b)
=a³+a²b- a²b - ab² + ab² + b³ + (a+b)
=a³+b³+a+b
Thus option 2) is correct
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...Hope it helps....
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