1.

The expression of (x - y)n, n ≥ 5 is done in the descending powers of x. If the sum of the fifth and sixth terms is zero, then \(\frac{{\rm{x}}}{{\rm{y}}}\) is equal to

A. \(\frac{{{\rm{n}} - 5}}{6}\)
B. \(\frac{{{\rm{n}} - 4}}{5}\)
C. \(\frac{5}{{{\rm{n}} - 4}}\)
D. \(\frac{6}{{{\rm{n}} - 5}}\)
Answer» C. \(\frac{5}{{{\rm{n}} - 4}}\)


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