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NTA Abhyas JEE Main2020MathematicsBinomial TheoremPractice

Coefficient of x 48 in ∑ r = 0 50 C 50 r x - 2 r 3 50 - r

Options

  1. AC 50 2
  2. BC 48 2
  3. C3 48
  4. D2 48

Correct answer

A. C 50 2

Step-by-step solution

∑ r = 0 50 C 50 r 3 50 - r x - 2 r = 3 + x - 2 50 = x + 1 50 Coefficient of x 48 in 1 + x 50 is C 50 48 = C 50 2

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