Question

Hej musze obliczyc;

a) s6 jezeli

b) s8 13,-13,13,-13;.......

Answer 1

a)a₁=6/3=2

a₂=6/6=1

a₃=6/9=2/3

a₄=6/12=1/2

a₅=6/15

a₆=6/18=1/3

S₆=2+1+2/3+1/2+6/15+1/3=3+1+15/30+12/30=4+27/30=147/30

b)q=-1

s₈=a₁*(1-q⁸)/1-q=13*(1-(-1)⁸)/1-(-1)=13*(1-1)/1+1=13*0/2=0/2=0