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⇔ 7, U₂, U₃, U₄, ........., U₃₂, 103
≡ Penyelesaian:
⇔ Menentukan Beda (b):
⇒ b = [U₃₃ - U₁] / [33 - 1]
⇒ b = [103 - 7] / 32
⇒ b = 3
⇔ Menentukan Un:
⇒ Un = a + (n - 1)b
⇒ Un = 7 + (n - 1)3
⇒ Un = 7 + 3n - 3
⇒ Un = 3n + 4