please can you explain this to me I don't understand!

Question

Find the value of the following
10! 11! over 7! 13!
If your answer is not an integer, write it as an exact fraction.

thank you so very much

Answer 1

very similar to the other question you had
http://www.jiskha.com/display.cgi?id=1422645251

10!11!/(7!13!)
= (10x9x8x7! 11!)/(7! 13x12x11x10!)
= 10x9x8/(13x12x11) (after the 7!10! cancel)
= 60/143