Suatu banjar 4, 6, 8, 10, … berapakah nilai suku ke-101 dari banjar tersebut ?
a = 4
b = 6 – 4 = 2
Un = a + (n – 1)b
U101 = 4 + (101 – 1)(2)
U101 = 4 + (100 x 2)
U101 = 204
S₁ = 4
n = 101
beda = 2
Un = a + (n-1)b
U₁₀₁ = 4 + (101 – 1)2
U₁₀₁ = 4+ (100)2
U₁₀₁ = 4 + 200
U₁₀₁ = 204