diketahui barisan geometris 3,6,12,24 tentukan jumlah 10 suku pertama

3,6,12,24,48,98,196,392, 784,1568
kalok manual 3131

3,6,12,24 U1 = 3 , r = 2 Sn = a( r^n - 1) / r - 1 S20 = 3 ( 2^10 - 1) / 2-1 = 3(1024 - 1) / 1 = 3 ( 1023) = 3069