Maths-
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Question

If sum from n equals 3 to straight infinity of   fraction numerator blank to the power of n C subscript 3 over denominator n factorial end fraction equals a times e to the power of b plus c then descending order of a comma b comma c

is

  1. a comma b comma c
  2. a comma c comma b
  3. b comma c comma a
  4. b comma a comma c

The correct answer is: b comma a comma c

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