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1+3+5+......+51,Dau coroana plisssssss!!!!!!!!!!​

Răspuns :

Răspuns:

1+3+5+...+(2n-1) = n^2

1+3+5+...+51 = n^2

2n-1=51 =>n=26

1+3+5+...+51 = 26^2 = 676