Skip to content

Course home

Sign up

1.1 Proof by Contradiction

EasyMedium
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182
Question 62
i.

Use proof by contradiction to show that for all real values of xxx,

(x−6)2≥2x−46 (x - 6)^2 \geq 2x - 46 (x−6)2≥2x−46
[3]
ii.

Show that the following statement is untrue:

"2n+2n−12^n + 2n - 12n+2n−1 is a prime number for all values of n∈Z+n \in \mathbb{Z}^{+}n∈Z+."

[3]
Markscheme

1.1 Proof by Contradiction Questions

  1. A Level
  2. /Maths
  3. /1.1 Proof by Contradiction

107 exam-style questions on Edexcel A Level Maths 1.1 Proof by Contradiction. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank