+407 How many five-digit numbers have distinct digits which are decreasing from left to right? (For example, 96531 is such a number.)
+201 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
:)
