Question

Evaluate

Answer 1

do you know what 9! and 7! equal to?

Answer 2

362880
5040

=72?

Answer 3

right

Answer 4

that was oddly quick

Answer 5

\[\frac{9*8*7*6*5*4*3*2*1}{7*6*5*4*3*2*1}\]
what can you cancel from top and bottom?

Answer 6

\[\frac{9!}{7!}=\frac{9\times8\times7!}{7!}=9\times8\]