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tmua.fyi Mock Paper 2 · Q3

Paper 2Logic & proofNumber & counting

Consider the claim: ‘For every integer n≥2n\ge2, the value n2−n+11n^2-n+11 is prime.’ Which of the following is a counterexample?

An=5n=5
Bn=10n=10
Cn=11n=11
Dn=2n=2
Ethere is no counterexample

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