Question

Cum aflu b5 intr-o progresie geometrica, daca b1=2 si b2=6? DAU COROANA

Answer 1

b1=2
b6=6
b5=?
Aflam q:
$b_{2}=b_{1}*q=\ \textgreater \ q= \frac{b_{2}}{b_{1}} =\ \textgreater \ q= \frac{6}{2} =3=\ \textgreater \ q=3$
$b_{5}=b_{1}*q^{4}\ \textless \ =\ \textgreater \ b_{5}=2*3^{4}=2*81=162 =\ \textgreater \ b_{5}=162$