In binomial expansion of (a - b)n, n ≥ 5, the sum of the 5th and 6t – McqOptions

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1.	In binomial expansion of (a - b)n, n ≥ 5, the sum of the 5th and 6th terms is zero. Then \(\rm \dfrac{a}{b}\) is equal to -
A.	\(\rm \dfrac{n-5}{6}\)
B.	\(\rm \dfrac{n-4}{5}\)
C.	\(\rm \dfrac{5}{n-4}\)
D.	\(\rm \dfrac{6}{n-5}\)
Answer» C. \(\rm \dfrac{5}{n-4}\)

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