How do you simplify #90times8!#?

2 Answers
MathFact-orials.blogspot.com
Dec 12, 2016

#90xx(8!)=90xx40,320=3,628,800#

Explanation:

#90 xx 8!#

#(8!)=8xx7xx6xx5xx4xx3xx2=40,320#

substituting in:

#90xx40,320=3,628,800#

Steve M
Jan 29, 2017

#90 xx 8! \ = 10 xx 9 xx 8! #
# \ \ \ \ \ \ \ \ \ \ \ \ = 10 xx 9!#
# \ \ \ \ \ \ \ \ \ \ \ \ = 10 xx 362880#
# \ \ \ \ \ \ \ \ \ \ \ \ = 3628800#

Related questions
See all questions in Factorial Identities
Impact of this question
10838 views around the world
You can reuse this answer
Creative Commons License