ESAT Maths 1 · free worked solution
ESAT Maths 1 probability ratios: use all outcomes
Probability-ratio solution: turn four exhaustive ratio parts into the required 7/10.
Answer first
Option CThe correct answer is
Because the outcomes are exhaustive, every ratio part belongs in the total before you select the requested categories.
This is original UniGenius practice material from the reviewed Maths 1 bank. It is not an official UAT-UK question, past paper, or recalled question.
The question
Read the setup, then choose the shortest valid route
Four mutually exclusive outcomes have probabilities in the ratio . What is the probability of an outcome from the last two categories?
Worked solution
The route in 3 steps
The ratio contains equal parts.
The last two categories contain parts.
Their combined probability is .
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