数字序列

Number sequences probe your inductive reasoning — extracting a rule from limited examples.

Rules here range from simple arithmetic progressions to polynomials and interleaved patterns.

Speed matters as much as accuracy; the goal is rapid rule identification.

Similar sequences appear on IQ tests, GMAT, and competitive entrance exams.

Each test is constructed using Item Response Theory (IRT) and Classical Test Theory (CTT) to ensure reliable measurement of knowledge and ability across different difficulty levels.

Questions undergo rigorous review including difficulty calibration, discrimination analysis, and distractor effectiveness evaluation to maintain high assessment quality.

1. Look at the first four numbers.
2. Identify the rule (add, multiply, square, Fibonacci…).
3. Type the next number and press Enter.
4. Wrong answers show the rule briefly.