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KCET2009MathematicsLimits

_ n 3 2^ n+1 -4 5^ n+1 5 2^ n +7 5^ n is equal to

Options

  1. A3 5
  2. B- 4 7
  3. C- 20 7
  4. D0

Correct answer

C. - 20 7

Step-by-step solution

aligned _ n 3 2^ n+1 -4 5^ n+1 5 2^ n +7 5^ n &= _ n 5^ n (6 ( 2 5 )^ n -20 ) 5^ n (5 ( 2 5 )^ n +7 ) &=- 20 7 aligned

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