Course home

1.1.4 Proof by contradiction (A-level only)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92

Question 30

Use proof by contradiction to show that there exist no integers $x\,$ and $y\,$ for which $14 x + 21 y = 5$ .

[4]

Markscheme

1.1.4 Proof by contradiction (A-level only) Questions

A Level
Maths
1.1.4 Proof by contradiction (A-level only)

107 exam-style questions on OCR A Level Maths 1.1.4 Proof by contradiction (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

1.1.4 Proof by contradiction (A-level only)

Question bank

1.1.4 Proof by contradiction (A-level only)

Easy Medium Hard

Question 30

Use proof by contradiction to show that there exist no integers $x\,$ and $y\,$ for which $14 x + 21 y = 5$ .

[4]

Markscheme

1.1.4 Proof by contradiction (A-level only) Questions

A Level
Maths
1.1.4 Proof by contradiction (A-level only)

107 exam-style questions on OCR A Level Maths 1.1.4 Proof by contradiction (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.