👤

calculeaza: 
a(10)=4
a(12)=100
a(13)=???? ( progresie geometrica )
Heeeeeelp:>


Răspuns :

Progresia geometrica se noteaza cu b. b12=b1*q²; q²= b12/b10=100/4=25 q= 5. b13=b12*q=100*5=500. :)