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Cât face 1+ 2+3+4+.........200​

Răspuns :

1+2+3+4+...+200

(200·201):2

40200:2

20100

Formula folosita:

1+2+3+ ... +n

[n·(n+1)]:2

Salut!

1+2+3+4+.....+200=

=200×(200+1):2=

=200×201:2=

=40200:2=

=20100