1+2+3+4+5+6.+10000000000=?

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1+2+3+4+5+6.+10000000000=?

1+2+3+4+5+6.+10000000000=?
1+2+3+4+5+6.+10000000000=?

1+2+3+4+5+6.+10000000000=?
(1+10000000000)*10000000000/2=50000000005000000000

[1+10000000000]*10000000000*1/2=50000000005000000000

(1+10000000000)10000000000/2
=100000000010000000000/2
=5000000005000000000