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Very short answer·Routine exam skill (2/5)·No calculatorNeeds mentor review

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

Box AA is chosen with probability 35\frac35 and has red probability 25.\frac25. Box BB is chosen with probability 25\frac25 and has red probability 34.\frac34.
Total: 2 marks

(a) Find the probability of drawing a red ball. (2 marks)

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