AIR MATH

Math Question

Which of the following statements regarding the expansion of \( (x+y)^{n} \) are correct? A. The coefficients of \( x^{n-1} \) and \( y^{n-1} \) both equal 1 . B. For any term \( x^{a} y^{b} \) in the expansion, \( a-b=n \). C. For any term \( x^{a} y^{b} \) in the expansion, \( a+b=n \) D. The coefficients of \( x^{n} \) and \( y^{n} \) both equal \( 1 . \)

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