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Ditanya : U₁₉
Penyelesaian :
U₂ + U₁₅ + U₄₀ = 165
a + b + a + 14b + a + 39b = 165
a + a + a + b + 14b + 39b = 165
3a + 54b = 165
3 ( a + 18b ) = 165
a+ 18b = 165/3
a + 18b = 55
Karena U₁₉ = a + 18b , maka U₁₉ = 55