Dik : a = 5 r =2 Dit : a, 5 suku pertama barisan Geometri b, U15 c, S10

a = 5
r = 2

A) 5, 10, 20, 40, 80, 160, 320, 640, 1280, 2560
B) 
U15 = ar^n-1
= 5. 2^14
= 5 . 16384
= 81920

C) 
[tex]S10 = \frac{a ( r^n -1)}{r-1} [/tex]
[tex]= \frac{5 (2 ^{10} - 1)}{2-1} [/tex]
= 5 . 1023 
= 5115