What is the sum of all integers

1.	What is the sum of all integers
Answer» Sum of all integers is 0 0 Is the sum of n positive integers formula, n(n+1)2n(n+1)2, applicable to sets of consecutive integers as well?For instance, if I wanted to calculate sum of first 20 multiples of 3, could I use: 3 x 20(21)220(21)2a similar approach has been used for even numbers. 1+2+3+4.........infinity =-1/12So the sum of all the integer is -1/12 n(n+1)/2

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