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Mr. Rothman is using the Binomial Theorem to find the binomial expansion of (a+b)7

Which of the following is a term in the expansion?

21a6b
21 A to the 6th power b

a4b3
A to the 4th power b cubed

21a2b5
21 A squared b to the 5th power

21a2b4

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21 a squared b to the 4th power

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