TMUA Official 2019 Paper 2 · Question 5

Official papers

Official 2019 Paper 2 · Q5

Paper 2Logic & proofNumber & counting

Consider the following statement about the positive integers $a$ , $b$ and $n$ :

$(*)$ : $ab$ is divisible by $n$

The condition ‘either $a$ or $b$ is divisible by $n$ ’ is:

Anecessary but not sufficient for

(*)

Bsufficient but not necessary for

(*)

Cnecessary and sufficient for

(*)

Dnot necessary and not sufficient for

(*)

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