Lê Quốc Trần Anh Coordinator
07/04/2018 at 09:44-
Lê Anh Duy 11/04/2018 at 15:12The factorials that are divisible by 9 is 9!, 10!, 11!, 12!,..., 100! (These factorials contains factor 9)
=> There are: (100 - 9) + 1 = 92 (factorials)
Lê Quốc Trần Anh selected this answer. -
FC Alan Walker 08/05/2018 at 02:22
Lê Anh Duy is wrong.
\(6!=1.2.3.4.5.6=9.1.2.4.5.2⋮9\)
So there are: 92+1=93(factorials)