Hitunglah 2+4+8+16 sampai 10 suku

jawab
deret geo
a = 2
r = 4: 2= 2

s10= a . (r^10 - 1) / ( r -1)
s10 = 2. (2^10 -1) / (2  - 1 )
s 10 =2 (1023)= 2046