Question

Diket : geometri 3+6+12+24+... tentukan rasio , suku ke 8 , jumlah 10 suku pertama

Answer 1

Rasio = U2/U1= 6/3=2

Suku ke 8
U8= ar^8-1
= 3(2^7)
= 3(128)
= 384

S10 = a(r^n - 1) / r-1
= 3(2^10 - 1) / 2-1
= 3(1024-1)
= 3(1023)
= 3069