Question

S=7+8+9+...+98+99+100​

Answer 1

n=(u-p):r+1

n=(100-7):1+1

n=93:1+1; n=94

S=(u+p)×n:2

S=107×94:2

S=107×47

S=5029

Legenda:

n=numarul de numere

u=ultimul termen

p=primul termen

r=ratia (regula dintre termeni)

s=suma numerelor