2+4+6+8+---------+1002+4+6+8+-----------+100

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2+4+6+8+---------+1002+4+6+8+-----------+100
2+4+6+8+---------+100
2+4+6+8+-----------+100

2+4+6+8+---------+1002+4+6+8+-----------+100
(2+100)*99/2=5049