How many five-digit numbers have distinct digits which are decreasing from left to right? (For example, 96531 is such a number.)

ss333 May 1, 2021

#1**+1 **

Say the number is ABCDE

"A" would have **9** solutions 1-9

"B" would also have **9** solutions 1-9 - one number +zero

"C" would have **8** solutions

"D" would have **7 **solutions

"E" would have **6 **soultions

9*9*8*7*6 is

27216

:)

mathisopandcool May 1, 2021