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2014-07-04T21:55:28+03:00
(1 + 9) + (2 + 8) + (3 + 7) + (4 + 6) + 5 + 10 = 10 + 10 + 10 + 10 +5 + 10 =55
0 + (2 + 18) + (4 + 16) + (6 + 14) + (8 + 12) + 10 = 20 + 20 +20 + 20 + 10 = 90
1 5 1
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2014-07-04T22:25:44+03:00
Se foloseste formula !+2+....+n=n(n+1)/2
1+2+....+10=10*11/2=55
2+4+....+18=2(1+2+....+9)=2*9*10/2=90
2 5 2