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The sum of the series 1+ 1 4.2 ! + 1 16.4 ! + 1 64.6 ! + ad inf. is

Options

  1. Ae -1 e
  2. Be +1 e
  3. Ce -1 2 e
  4. De+1 2 e

Correct answer

D. e+1 2 e

Step-by-step solution

e^x+e^ -x 2 =1+ x^2 2 ! + x^4 4 ! + x^6 6 ! + putting x=1 / 2 we get e+1 2 e

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