Find the product
(d1)(d41+d40+d39++d3+d2+d+1)\displaystyle {\left({d}-{1}\right)}{\left({d}^{{41}}+{d}^{{40}}+{d}^{{39}}+\ldots+{d}^{{3}}+{d}^{{2}}+{d}+{1}\right)}


Ans =