LogFAQs > #945226328

Reducing failure rate also becomes less valuable as the failure rate decreases. If failure is rolling 2 or below on a d20, +1 improves your success rate by a mere 5.6% (multiplicatively). If failure is rolling 19 or below, then +1 improves your success rate by 100%. Comparatively, a reroll has a 90% chance of succeeding in the former case, but only a 5% chance in the latter, making the +1 much better.

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