Posted by vinit singh on Monday, October 3, 2011 at 9:49am.
three digits can be 0 to 9 or ten things taken 3 at a time
one digit can be 4 to 0 or seven things
one at a time
the fifth, on the left, can be 2 - 9 or 8 things
permutations of 10 things taken 3 at a time = 10!/(10!-3!) = 10*9*8
then 7!/6! = 7
then 8!/7! = 8
so
10*9*8*7*8 - 1 because 24000 itself is excluded.
Related Questions
math - i am a 5 digit palindromic number. My third digit is 5 more than my fifth...
algebra - For every positive 2-digit number, x, with tens digit t and units ...
math - The number uses every number 0-9 the numbers are used only once the ...
math - i have a six digit question my 100 thousands is one less than my ones ...
data management - from the digits 0,1,2,3,4,5,6,7,8,9 find the number of a) 4-...
Data management - from the digits 0,1,2,3,4,5,6,7,8,9 find the number of a) 4-...
singapore math - My 3rd grade son get this math problem. It states that John ...
math - need help with math word problems. just don't understand. What is the...
word problem - the different between the digit of a two digit number is 1, the ...
word problem - the different between the digit of a two digit number is 1, the ...
For Further Reading
