HZF, IWH, KSJ, NNL, ?
Answer: D
Correct answer: RHN
Each letter of the group moves on its own rule. The first letters run H, I, K, N, ? with gaps of \( +1, +2, +3, +4 \), giving \( \mathrm{N} + 4 = \mathbf{R} \). The second letters run Z, W, S, N, ? with gaps of \( -3, -4, -5, -6 \), giving \( \mathrm{N} - 6 = \mathbf{H} \). The third letters run F, H, J, L, ? rising by 2 each time, giving \( \mathbf{N} \). So the group is RHN.
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