Ten persons L, M, N, O, P, Q, R, S, T, and U were born on either the 15th or the 30th of five different months: January, March, April, September, and ...
Question
Ten persons L, M, N, O, P, Q, R, S, T, and U were born on either the 15th or the 30th of five different months: January, March, April, September, and November (not necessarily in that order). The following conditions apply:
- L was born on the 15th of a month with 31 days.
- Exactly three persons were born between L and P.
- Exactly four persons were born between P and O.
- O was born before L.
- The number of persons born after O is equal to the number of persons born before N.
- Exactly one person was born between P and R.
- M was born before T but not in January.
- T was born before P.
- U was born before S on the same date.
Based on the above information, answer the following question:
Four of the following five pairs are alike in a certain way and form a group. Which one does NOT belong to that group?