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Three of the following four letter-cluster pairs are alike in a certain way and thus form a group. Which is the letter-cluster pair that does NOT belong to that group? (Note: The odd one out is not based on the number of consonants/vowels or their positions in the letter-cluster.)
QT - PS
FD - LK
LO - KN
FI - EH
FD - LK
Calculate the alphabetical position difference between the two letters in each pair. If the difference is consistent for three pairs, the one that differs is the odd one out.
Calculate the alphabetical position difference between the two letters in each pair. If the difference is consistent for three pairs, the one that differs is the odd one out.
Analyze Pair QT - PS
Q=17, T=20 (Diff=3); P=16, S=19 (Diff=3). Both clusters have a gap of 3.
Analyze Pair FD - LK
F=6, D=4 (Diff=2); L=12, K=11 (Diff=1). The gaps are 2 and 1, which do not follow the '3' pattern.
Analyze Pair LO - KN
L=12, O=15 (Diff=3); K=11, N=14 (Diff=3). Both clusters have a gap of 3.
Analyze Pair FI - EH
F=6, I=9 (Diff=3); E=5, H=8 (Diff=3). Both clusters have a gap of 3.
A: Both sub-pairs maintain a gap of 3. C: Both sub-pairs maintain a gap of 3. D: Both sub-pairs maintain a gap of 3.
B is correct because it is the only option where the alphabetical gaps between the letters are not consistently 3.
In letter-cluster reasoning, always convert letters to their numerical positions (A=1, Z=26) immediately; it makes identifying arithmetic patterns significantly faster.
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