5,30,180,1080 tentukan suku ke 7

b=kali 6
u6=5x6^6-1
=5x6^5
= 5x7776
=38880


jadi u6=38880
....good luck..... :)
maaf klo slah..

^ artinya pangkat

5,30,180,1080,... Barisan geometri

a = 5
r = U2/U1 = 30/5 = 6

Un = a . r^n-1
U7 = 5 . 6^7-1
U7 = 5 . 6^6
U7 = 5 . 46656
U7 = 233280



Moga membantu....