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2014-10-26T13:03:59+02:00
(a+1)+(a+3)+(a+5)+.......+(a+101)=2703


a+a+a+..+a+(1+3+5+..101)=2703

a+a+a+..+a+(1+3+5+..2*50+1)=2703

a*51+(50+1)²=2703

a*51+51²=2703

a*51+2601=2703

a*51=2703-2601
a*51=102
a=102:51
a=2




2014-10-26T13:20:16+02:00