Geometric sequences

Practise geometric sequences, common ratios and missing parameters. Work with positive and negative multipliers, nonconsecutive observations, inserted geometric means and exact term membership. Questions distinguish a value’s sign from its magnitude and show how logarithms connect positive geometric sequences with arithmetic ones.

Both single-select and multiselect items progress from direct evaluation to conditional reasoning and parameter ambiguity. Detailed explanations verify the original terms, preserve integer indices and state when division is valid. A special recurrence-based question explicitly includes zero starting values and a zero multiplier, so no undefined quotient is silently used. Use exact arithmetic; finite and infinite geometric sums belong to later sets.