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Un = ar^{n-1}
U1 = a = 2
U4 = ar³ = 1/4
Maka :
r = ∛(U4 : U1)
r = ∛(1/4 : 2)
r = ∛1/8
r = 1/2
Jumlah 5 suku pertama
= a x (r^n - 1) : (r - 1)
= 2 x {(1/2)⁵ - 1} : {1/2 - 1}
= 2 x {1/32 - 1} : {- 1/2}
= 2 x {- 31/32} : {- 1/2}
= 124/32
= 3 7/8