Barisan bilangan 1,4,16,64,...... Tentukan U9 dan S9

Bab Barisan dan Deret
Matematika SMP Kelas VIII

Geometri

1, 4, 16, 64

a = 1

r = U2 : U1
  = 4 : 1
  = 4

U9 = a x r⁸
     = 1 x 4⁸
     = 65.536

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Sn = (a x (rⁿ - 1)) / (r - 1)

S9 = (1 x (4⁹ - 1)) / (4 - 1)
     = (262.144 - 1) / 3
     = 262.143/3
     = 87.381