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Verified answer
Kelas 8 MatematikaBab Barisan dan Deret Bilangan
^ = pangkat
r = ^(5 - 2)√(U5 / U2)
r = ∛(80/10)
r = 2
a = U2 : r
a = 10 : 2
a = 5
Sn = a . (rⁿ - 1) / (r - 1)
S6 = 5 . (2⁶ - 1) / (2 - 1)
S6 = 5 . (64 - 1) / 1
S6 = 5 . 63
S6 = 315 cm