Letter Series
IntellectualSpot the hidden rule in a row of letters and pick the next one — the letter analogue of number series, training serial induction on the alphabet.
Overview
Letter Series tests serial induction — your ability to infer the rule behind an ordered run of symbols and extend it. Each item shows a row of letters governed by a hidden pattern over alphabet position (A=1 … Z=26): a constant step forward or backward, a gap that grows or shrinks, two alternating steps, two interleaved sub-series (one may rise while the other falls), a fixed letter repeating between an advancing series, or a wide skip that wraps past Z back to A. You read the positions, find the rule, and choose the next letter. It is the letter analogue of number series and trains the same inductive-reasoning skill as used by cut-e, DLR, ADAPT, SHL and comparable batteries. Every question offers five options where the wrong answers are plausible mistakes (off-by-one on the letter or the step, or the wrong sub-series). Take it as a Progression Test (a fixed set) to measure yourself against a target, or as a timed Open Challenge (10, 20, or 30 minutes) where your score feeds the Top Scores leaderboard.
Assessments
Could show up in DLR-based selections.
Airline mappings are based on public information and may change.
Example: which letter comes next?
Each item shows a row of letters ending in a blank. Convert each letter to its position in the alphabet (A=1 … Z=26), find the rule over those numbers, and pick the next letter from the five options.
The positions are 1, 3, 5, 7 — a constant step of +2. The next position is 9, which is I. The near-misses H (position 8) and J (10) are off by one step; working in numbers instead of letters keeps you from miscounting.
Game Phases
Configure
Pick a Progression Test (a fixed set of series) or a timed Open Challenge (10, 20, or 30 minutes).
Solve
Identify the pattern in each row of letters and pick the next letter from five options as quickly and accurately as you can.
Review
After finishing, review your score and inspect each series, your answer, and the rule.
More Practice
Sequences
4 exercisesNumber Sequences: Full Test
The full progress test for number sequences — a mixed drill combining 30% easy, 40% medium and 30% hard sequence types to mirror the difficulty level of real pilot assessments.
Number Sequences: Easy
Spot the pattern and predict the next number in short numeric sequences — the foundation for harder sequence tests.
Number Sequences: Medium
Step up from easy — interleaved sub-sequences, alternating operations, squaring and square roots mixed into harder numeric patterns.
Number Sequences: Hard
The toughest sequence test — tribonacci, prime-index jumps, interleaved fractions and powers, and multi-operation chains designed to mirror the difficulty level of real pilot assessments.