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Septic Factorization

Algebra Level 2

Which of these answer choices is the factorization of $(a+b)^7-a^7-b^7$ ?

7ab(a+b)(a^2+ab+b^2)^2

5ab(a+b)^6

5(a+b)^2(a^2+ab+b^2)

7ab(a+b)^5

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by Danish Ahmed

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