$$\frac{ 15 \times 14 \times 13 \times 12 \times 11 \times 10 \times 9 }{ 1 \times 2 \times 3 \times 4 \times 5 \times 6 \times 7 }$$
$6435$
$$5\times 9\times 11\times 13$$
$$45\times 11\times 13$$
$$495\times 13$$
$$6435$$
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$3^{2}\times 5\times 11\times 13$
