JEE Math Practice Question
In the binomial expansion of $${\left( {a - b} \right)^n},\,\,\,n \ge 5,$$ the sum of $${5^{th}}$$ and $${6^{th}}$$ terms is zero, then $$a/b$$ equals
- A.$${{n - 5} \over 6}$$
- B.$${{n - 4} \over 5}$$
- C.$${5 \over {n - 4}}$$
- D.$${6 \over {n - 5}}$$
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