概率 gàilǜ probability (maths)
How to remember 概率: 概 generally + 率 to command = probability (maths).
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How it is used
- Probability (mathematical) - 概率很低 (gàilǜ hěn dī) the probability is low, 概率论 (gàilǜ lùn) probability theory.
- The technical math/statistics term; the 率 reads lǜ.
- Contrast 可能性 (kěnéngxìng, likelihood, everyday); 概率 is the quantified mathematical probability.