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Number Series

Find the missing number in each sequence. Take your time — there's no forced timeout. Patterns include arithmetic, geometric, squares, Fibonacci and more.

Pattern types you'll see

Arithmetic — constant difference (e.g. +5 each step)
Geometric — constant ratio (e.g. ×3 each step)
Squares & Cubes — n², n³ sequences
Fibonacci — next = sum of previous two
Difference patterns — second-order differences
Prime number sequences