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3.1.1 Proof (A-level only)
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Question 77
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Markscheme
Given that
n∈Nn \in \mathbb{N}
n
∈
N
, use algebra to prove by contradiction that
“if n2+6n+3 is even, then n is odd” \text{“if } n^2 + 6n + 3 \text{ is even, then } n \text{ is odd”}
“if
n
2
+
6
n
+
3
is even, then
n
is odd”
[4]
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3.1.1 Proof (A-level only) Questions
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3.1.1 Proof (A-level only)
