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Question

If vertical line x vertical line less than 1 fifth, the coefficient of x cubed in the expansion of  fraction numerator 1 over denominator left parenthesis 1 minus 5 x right parenthesis left parenthesis 1 minus 4 x right parenthesis end fraction is

  1. 369    
  2. 370    
  3. 371  
  4. 372  

The correct answer is: 369

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