2+4+6+8.+268

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2+4+6+8.+268
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2+4+6+8.+268
2+4+6+8.+268

2+4+6+8.+268
2+4+6+8.+268
=2*(1+2+3+4...+134)
=2*(134*135/2)
=134*135
=18090

+10

2+4+6...+268
=(2+268)x134/2
=270/2x134
=135x134
=13500+4020+1670
=18190