U₄ = 7, U₁₁ = 21 tentukan U ke 40
Matematika
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Pertanyaan
U₄ = 7, U₁₁ = 21 tentukan U ke 40
1 Jawaban
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1. Jawaban detektif07
u₁₁ = 21 = a + 10b
u₄ = 7 = a + 3b
_____________ -
14 = 7b
b = 2
7 = a + 3b
7 = a + 3(2)
7 = a + 6
a = 1
u₄₀ = a + 39b
u₄₀ = 1 + 39(2)
u₄₀ = 1 + 78
u₄₀ = 79