Răspuns :

Mexicanu2id

Răspuns:

folosesti formula n*(n+1)/2 practic ai 77*78/2 as simple as that si raspunsul e 3003

Salut!

Vom folosii suma lui Gauss!

Formula: n(n+1)\2

1 + 2 + 3 + 4 + .... + 76 + 77 <=>

<=> 77 × ( 77 + 1 ) / 2 <=>

<=> 77 × 78 / 2 <=>

<=> 77 × 39 <=>

<=> 3003

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