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1 + 1 = 2
?+3+4+5+6+7+8+9+......+100000000000000
2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + ........ + 100000000000000
1+1=2
1+1=? +3+4+5+6+7+8+9+......+100000000000000.
\Rightarrow ? +3+4+5+6+7+8+9+......+100000000000000=2
?= -(1+2+3+4+...+999999999999998)