If neN&n is even, then, 1.(n-)! 3!(13)! 5!() (A) 2 (C) 2 ! (D) none of these In the anni

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( frac{1}{1-n-1}+frac{1}{3 ! n-3 !}+frac{1}{n-11} ) Myltiply & druide by ( n ) j ( frac{1}{n !}left(frac{n !}{n-1}+frac{n !}{n ! n-3 !}+frac{n !}{n-1 ! 1}right) ) ( frac{1}{n !}left[n_{1}+n_{3}+frac{n}{n-1}right] ) ( x_{1}+y_{3}+frac{x}{4-1}=2^{n-1} ) ( =frac{1}{n !} 2^{n-1} )

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