What about following sum?

-infinity.........+-3 + -2 + -1 + 0 + 1 + 2 + 3 .........+infinity

I guess answer to this is -1/12 :)

1+2+3+4+5+....+infinity = infinity

You can only play around by switching positions in a series if you consider both ends because its infinite series..

## Infinity ..... meeting both ends..

What about following sum?

-infinity.........+-3 + -2 + -1 + 0 + 1 + 2 + 3 .........+infinity

I guess answer to this is -1/12 :)

1+2+3+4+5+....+infinity = infinity

You can only play around by switching positions in a series if you consider both ends because its infinite series..