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1-3+5-7+9-11+....................upto n terms,
1+5+9+................till n/2 terms
=n/4(2n-2)
=n(n-1)/2-----------------------------------------1
3+7+11+15+......................till n/2 terms
=n/4(2n+4)
=n(n+2)/2----------------------------------------2
so,1-3+5-7+9-.................................n terms
=n(n-1)/2-n(n+1)/2-------------------------------------from 1 and 2
=n/2(n-1-n-2)
=-3n/2
so,answer is(-3n/2)
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