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Verified answer
Kelas 8 MatematikaBab Barisan dan Deret Bilangan
^ = pangkat
r = ^(5 - 1)√(U5/U1)
r = ^4√(160/10)
r = ^4√16
r = 2
Sn = a . (r^n - 1)/(r - 1)
S5 = 10 . (2^5 - 1)/(2 - 1)
S5 = 10 . (32 - 1)/1
S5 = 10 . 31
S5 = 310 cm
Verified answer
Mapel : MatematikaBab : Barisan dan deret
n = 5
U1 = a = 10 cm
U5 = a × r^4 = 160 cm
U5/U1
S5 = a × (r^n - 1)/r - 1
S5 = 10 × (2^5 - 1 )/2 - 1
S5 = 10 × 2^5 - 1
S5 = 10 × 32 - 1
S5 = 10 × 31
S5 = 310 cm