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

a.
5, 10, 20, 40, 80

b.
U15 = ar^(15-1)
U15 = ar^14
U15 = (5)(2)^14
U15 = 81920

c.
S10 = [a(r^10 - 1)]/[r - 1]
S10 = [5(2^10 - 1)]/[2 - 1]
S10 = [5(1024 - 1)]/1
S10 = 5115