Do you know the value of - 1-2+3-4+5-6+.........=1/4 Let S=1-2+3-4+....... _(1) Now adding s in equation (1) like binomial S=1-2+3-4+....... S= 1-2+3-4+....... 2S=-1+1-1+1-....... Now multiply by minus sign -2S=1-1+1-1+1-.......... We know that 1-1+1-1+1-........=1/2 //See my previous blog. Now -2S=1/2 S = -1/4
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