" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2025 KUDO.TIPS - All rights reserved.
q=3
S5=1+3+9+27+81=121
wzor:
Sn=a1*(1-q^n)/(1-q)
S₅=(1-3⁵)/(1-3)=-1/2*(1-243)=1/2*242=121