E bine cum am facut? Nu sunt sigura si va rog sa ma corectati daca am gresit ,treb sa arat ca nu e patrat perfect
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2+4+6+....+100
2 (1+2+3+....+50)
2( 50x51) :2 ---> x2 cu :2 se anuleaza
deci rezultatul e 50x51 = 2550