Course home

1.1 Proof

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 93 94 95 96 97 98 99 100

Question 100

A security researcher is investigating a cryptographic protocol where valid key pairs $(n, m)$ must satisfy the property that $n$ and $m$ are integers such that:

n^2 - 20m - 14 = 0

Prove that $n$ is even.

[2]

Hence, prove that $10 m + 7$ is even and explain why this leads to a contradiction.

[3]

Explain what can be deduced about the existence of valid key pairs $(n, m)$ for this protocol.

[1]

Markscheme

1.1 Proof Questions

A Level
Maths
1.1 Proof

132 exam-style questions on OCR (MEI) A Level Maths 1.1 Proof, covering 1.1.1 Structure of mathematical proof, 1.1.2 Disproof by counter example, 1.1.3 Proof by contradiction (A-level only), and 1.1 Proof. Each one has a worked solution and a mark scheme showing where the marks go.

1.1 Proof

Question bank

1.1 Proof

Easy Medium Hard

Question 100

A security researcher is investigating a cryptographic protocol where valid key pairs $(n, m)$ must satisfy the property that $n$ and $m$ are integers such that:

n^2 - 20m - 14 = 0

Prove that $n$ is even.

[2]

Hence, prove that $10 m + 7$ is even and explain why this leads to a contradiction.

[3]

Explain what can be deduced about the existence of valid key pairs $(n, m)$ for this protocol.

[1]

Markscheme

1.1 Proof Questions

A Level
Maths
1.1 Proof