Answers

2014-08-11T19:58:20+05:30
This is nothing but (1000-1)^3
(a-b)^3 = a^3 -3ab(a-b)-b^3
(1000-1)^3 = 1000^3 -3*1000*1(1000-1)-1^3
                = 1000000000-3000*999-1
                = 997002999
                     
0
2014-08-11T20:17:45+05:30
Q. (1000-1)³
= 1000³ -3×1000²×1+3×1000×1²+1³
= 1000000000-3000000+3000+1
= 997002999
0