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Kalau tidak salah
potongan terpanjang (Un) = 324 cm
Dit : Sn = ....?
Penye :
==> Un = ar^n-1
324 = 4.r^4
81 = r^4
r = 3
sehingga :
Sn = a(r^n - 1)
-------------
r- 1
S5 = 4 (3^5 - 1)
---------------
3- 1
S5 = 2(243-1)
S5 = 484 cm ✔✔✔