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Kristofszandra
a fost răspuns

Aflati sums primelor 20 de numere impaired.

Răspuns :

SemperFi
Primele 20 de numere impare sunt:

1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39.

1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31+33+35+37+39 = 400
Aejeong
1+3+5+.......+39= (1+39)•21/2=40•21/2=20•21=420

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