Answer 1

\[ 5 \times 6 \times 7 \times 8 \times 9 \times 10 = \frac{1 \times 2 \times 3 \times 4 \times 5 \times 6 \times 7 \times 8 \times 9 \times 10}{1 \times 2 \times 3 \times 4}\]
\[ = \frac{10!}{4!}\]