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n=5
U1 =a = 2
U5 = 162 (terpanjang)
S5?
U5 = a.r^4
162= 2.r^4
81 = r^4
3 = r
karena r > 1, maka
Sn = a(r^n -1) /r-1
S5 = 2(3^5 -1)/ 3-1
S5 = 2(243-1)/ 2
S5 = 242
jadi panjang tali semula 242 cm
maap klo salah