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How many different ways can the letters in "QOS" be arranged?
QOS
QSO
SOQ
SQO
QSO
Look at each position independently: The 1st letter moves +1 forward, the 2nd letter moves +1 forward, and the 3rd letter moves +1 forward alphabetically.
Look at each position independently: The 1st letter moves +1 forward, the 2nd letter moves +1 forward, and the 3rd letter moves +1 forward alphabetically.
Analyze 1st Letters
The first letters follow the sequence M тЖТ N тЖТ O тЖТ P. Adding 1 to the alphabetical position of P gives Q.
Analyze 2nd Letters
The second letters follow the sequence O тЖТ P тЖТ Q тЖТ R. Adding 1 to the alphabetical position of R gives S.
Analyze 3rd Letters
The third letters follow the sequence K тЖТ L тЖТ M тЖТ N. Adding 1 to the alphabetical position of N gives O.
A: QOS starts with the correct first letter but has the 2nd and 3rd letters swapped (O and S). C: SOQ has the correct letters but in the wrong order. D: SQO has the correct letters but in the wrong order.
B is correct because the series follows a consistent +1 alphabetical progression for each of the three positions (M+1=N, N+1=O, O+1=P, P+1=Q; O+1=P, P+1=Q, Q+1=R, R+1=S; K+1=L, L+1=M, M+1=N, N+1=O), resulting in QSO.
Always break down three-letter or multi-element series into independent individual series. Don't try to look at the triplet as a whole; treat each position as its own distinct sequence.
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