👤

1+2+3....+2014=
Va rog repede​


Răspuns :

n(n+1)/2= 2014×2015/2= 2029105

Folosim formula lui Gauss :

1 + 2 + .. + n = n·(n + 1) : 2

S = 1 + 2 + .. + 2014

S = 2014×2015 : 2

S = 1007×2015

S = 2029105