Question

1+2-3-4+5+6-7-8+…-299-300+301+302

 

Answer 1

1+2-3-4+5+6-7-8+9+10-11-12+...-299-300+301+302

=1+(2-3-4+5)+(6-7-8+9)+(10-11-12+13)+...+(298-299-300+301)+302

=1+0+0+0+0+...+0+302

=1+302=303