Question

compute 11 factorial - 10 factorial by 9 factorial ​

Answer 1

Answer:

given:-

11!-10!/9!

now I can write 11! as

11×10×9!

I can write write 10! as 10×9!

so

11×10×9!-10×9!/9!

taking 9! common from numerator

9!(110-10)/9!

=100