Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the odd letter cluster.

NRW PTY ADL LPU

ADL

THE LOGIC; 1) NRW, N → (+4) → R → (+5) → W 2) PTY, P → (+4) → T → (+5) → Y 3) ADL, A → (+3) → D → (+8) → L 4) LPU, L → (+4) → P → (+5) → U Thus, ADL is the odd one.