Question

Cum se calculeaza 1+2+3+....+57=

Answer 1

Gauss:

1 + 2 + 3 + ... + n = n ( n + 1 ) : 2

1 + 2 + 3 + ... + 57 = 57 × ( 57 + 1 ) : 2

1 + 2 + 3 + ... + 57 = 57 × 58 : 2

1 + 2 + 3 + ... + 57 = 3 306 : 2

1 + 2 + 3 + ... + 57 = 1 653

Answer 2

1 + 2 + 3 + ... + 57 =

57 × 58 : 2 =

3306 : 2 = 1653