Psuedo math trick......

-
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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