LEARN · EXPLAIN · REVISE

P(A)=k/(k+2). Find P(Aᶜ).

Read the idea, work independently, then explain what changed.

TOPIC 01

Probability: mixed assessment

A mixed assessment: identify the method, justify it and revise your reasoning.

Use one hint at a time. A correction explains what changed, not just the final answer.

01 / Standard#Your turn

k=10

Skills and prerequisite lessons

Working and explanation

BUILD THE REASONING

Hint 1

Describe the sample space and event sets, then count or apply a probability identity.

Hint 2

An event and its complement partition the sample space.

Worked solution

Describe the sample space and event sets, then count or apply a probability identity.
Calculate or simplify this relation.
$P(A^c)=1-10/12=2/12$
The complement is relative to the stated sample space.

The requested value is 0.16666667.

Checks and common pitfalls: The complement is relative to the stated sample space.

Think first. Reveal a hint when the class is ready.

Teacher preparation and assessment