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U₇ = 320 cm
ditanya : S₇ = ... ?
jawab :
# U₁ = 5 cm
a = 5 cm
# U₇ = 320 cm
ar⁷⁻¹ = 320 cm
5r⁶ = 320 cm
r⁶ = 64 cm
r = 2 cm
Sn = a(rⁿ - 1) / (r - 1), maka :
S₇ = 5 (2⁷ - 1) / (2 - 1)
= 5 (128 - 1) / 1
= 5( 127) = 635 cm
jadi, panjang kabel mula - mula adalah 635 cm