Question

1+2-3-4+5+6-7-8+....+1998-1999-2000+2001

Answer 1

1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 +...+ 1998 - 1999 - 2000 + 2001

= 1 + (2 - 3 - 4 + 5) + (6 - 7 - 8 + 9) +...+ (1998 - 1999 - 2000 + 2001)

= 1 + 0 + 0 +...+ 0

= 1

Answer 2

=1+(2-3-4+5)+(6-7-8+9)+....+(1998-1999-2000+2001)

=1+0+0+....+0

=1