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In summation form, (a + b)^n is the sum over k of
AnCk a^(n-k) b^(n+k)
BnCk a^(n-k) b^k
CnCk a^(n+k) b^k
DnCk a^(2k) b^(n-k)
Answer & Solution
Correct answer: B. nCk a^(n-k) b^k
Each general term has a binomial coefficient nCk with a to the power n - k and b to the power k.
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