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2014-11-16T12:14:25+02:00
10+12+14+...+98
2*5+2*6+2*7+...+2*49
2(1+2+3+4+5+6+7+...+49)- 20
2*49*50/2+20
49*50+20=2470
2014-11-16T12:16:59+02:00
10+12+14+16+18+20+....98
2*(1+2+3+4+...+49
2*49*(49+1):2
98*50:2
4900:2
2450
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