Question

Which of the following is not a rational number when n = 4?
$(a) \: \frac{4n}{n}$

$(b) \: \frac{n - 3}{n \div 3}$

$(c) \: \frac{n - 4}{n + 4}$

$(d) \: \frac{n + 4}{n - 4}$

Please explain it.
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Answer 1

Answer:

$d \: is \: not \: rational \: number \:$

$because \: \frac{p}{q} \: where \: q \: \: equal \: not \: 0 \\ ana \: in \: d \: ( \: 4 - 4 = 0)$