JEE Math Practice Question
The coefficient of $${x^n}$$ in expansion of $$\left( {1 + x} \right){\left( {1 - x} \right)^n}$$ is
- A.$${\left( { - 1} \right)^{n - 1}}n$$
- B.$${\left( { - 1} \right)^n}\left( {1 - n} \right)$$
- C.$${\left( { - 1} \right)^{n - 1}}{\left( {n - 1} \right)^2}$$
- D.$$\left( {n - 1} \right)$$
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