Please do 13th question

Q13. The -coefficient of x70 in the product (x – 1) (x2 – 2) (x3 –3) (x4 – 4) ......(x12 –12) is 
     
              (a) 4                     (b) 6                    (c) 8                      (d) 12


Dear studnet

If we have to obtain coefficient of say x2 then we need to multiply two x(s) of any two bracket and constant term of other brackets. Similarly here we have determined the brackets omited and thus obtained the product of constant terms of these and added the products obtained from all possible solutions




Regards

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