Question

1+2-3-4+5+6-7-8+..._99-100+101+102

 

Answer 1

= 1 + ( 2-3-4+5 ) + ( 6 - 7 - 8 + 9 ) +.....+ ( 98-99-100+101 ) + 102 
= 1+ 0 + 0 +....+ 0 + 102
= 103 
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Answer 2

1+2-3-4+5+6-7-8+......-99-100+101+102

=1+(2-3-4+5)+(6-7-8+9)+.......+(98-99-100+101)+102

=1+0+0+.....+0+102

=1+102

=103

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