$$\frac { 4 } { 5 } = \frac { 4 \times 4 \times 2 \times 1 } { 525 }$$
$\text{false}$
$$420=4\times 4\times 2\times 1$$
$$420=16\times 2\times 1$$
$$420=32\times 1$$
$$420=32$$
$$\text{false}$$
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