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