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
1
\(\frac{{{\rm{n}} - 5}}{6}\)
2
\(\frac{{{\rm{n}} - 4}}{5}\)
3
\(\frac{5}{{{\rm{n}} - 4}}\)
4
\(\frac{6}{{{\rm{n}} - 5}}\)