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2014-06-04T14:09:15+03:00
A=primul nr
a+294=a*8=>
a+(a+2)+(a+4)+(a+6)+(a+8)+(a+10)+(a+12)=7a+42=a+294
6a=254
a=42
Proba:
42+44+46+48+50+52+54=336:8=42