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The coefficient of x 50 in (1 + x) 41 (1 - x + x 2 ) 40 is 1. 1 2. 2 3. 3 4.










 





























  The coefficient of x50 in (1 + x)41 (1 - x + x2)40 is
 
  1
 
  2
 
  3
 
 

Grade:12th Pass

1 Answers

Badiuddin askIITians.ismu Expert
148 Points
12 years ago

Dear Vishwesh

(1 + x)41 (1 - x + x2)40

=(1+x)(1 + x)40 (1 - x + x2)40

=(1+x)(1+x3)40

=(1+x3)40     +x(1+x3)40


both the term does not contain x50 term because 50 is not multiple of 3

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