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a = U₁ = 3
b = U₂ - U₁ = 3 3/4 - 3 = 3/4
Un = a + (n-1)b
U₄₀ = 3 + 39 x 3/4
U₄₀ = 3 + 117/4
U₄₀ = 129/4
U₄₀ = 32 1/4