Discussion
What should come in place of the question mark (?) in the given series in order to make it logically complete? PQ1, QM3, SJ7, ?, ZG31
Answer: D
The missing term is VH15. Take the three parts of each term separately. First letters: P, Q, S, ?, Z move by +1, +2, +3, +4, so the missing first letter is V. Second letters: Q, M, J, ?, G move by -4, -3, -2, -1, giving H. Numbers: 1, 3, 7, ?, 31 follow the rule double and add 1: 1, 3, 7, 15, 31, so the number is 15. The term is VH15. UI17, UG28 and VH25 fail at least one of the three rules: the number 25 is not 15, and 17 and 28 do not fit the doubling pattern.
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