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Dau coroana
Repede va roggg


Dau Coroana Repede Va Roggg class=

Răspuns :

1 a) 1+2+3+...+356= [356(356+1)]/2, conform [n x (n+1)]/2
b) 1+2+3+...+525= [525(526+1)]/2, conform [n x (n+1)]/2