2020HSCShort answer

Q15 (a) (ii)

1 mark

Question

Using the proposition $P$ from part (i), write down the contrapositive of $P$ .

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Solution

Criteria	Marks
Provides correct statement	1

Sample answer:

If $k^3+1$ is not divisible by 3, then $(k+1)$ is not divisible by 3.

Supplied marking guidance · human reviewed

Compare this with your working, not only your final sentence.

Syllabus alignment

Working MathematicallyProof

The Nature of ProofUse formal proof language, contradiction, counter-examples and rigorous arguments involving numbers and inequalities.

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