A) \[{{2}^{n}}+1\]
B) \[{{2}^{n}}-1\]
C) \[{{2}^{n}}\]
D) \[{{2}^{n-1}}\]
Correct Answer: D
Solution :
Sum of the coefficient of odd powers of x \[={{C}_{1}}+{{C}_{3}}+{{C}_{5}}+....={{2}^{n-1}}\]
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