5, 10, 20, 40, 80,…,… 1. Carilah U15! 2. Carilah S20! Tolong dijawab ya…

5, 10, 20, 40, 80
a = 5
rasio = 2

Un = a.r^(n-1)
U15 = 5. 2^(15-1)
U15 = 5. 2^14
U15 = 5. 16384
U15 = 81920

Sn = (a (r^n – 1)) / r – 1
S10 = (5 (2^10 – 1)) / 2-1
S10 = (5 (1024 – 1)) / 1
S10 = 5 (1023)
S10 = 5115