Which expression represents the fourth term in the binomial expansion of open paren e plus 2 f close paren to the 10th power ?

For (e + 2f)^10, the terms follow the binomial pattern: the fourth term uses the coefficient 10C3, with e raised to 10 − 3 = 7 and (2f) raised to 3. Thus the fourth term is 10C3(e^7)(2f)^3, which matches choice C.

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