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hi this series is of the form : n-(n+1)-(n+2) thus , S=summation(-n-3) = - (n(n+1)/2 ) - 3n simplifying, = (-n^2-7n)/2 now n=100, =(-10000-700)/2 =-10700/2 =|-5350|=5350 hope this helps rate me if m rite !!!!!!!!!
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Varsha be cool, tomorrow is what we make it today, so if u can dream it , u can make it . life is an ice cream ,eat it before it melts away!!!!!!!!!     
 
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