The total number of 4 digit numbers in which the digit are in descending order, is

The total number of 4 digit numbers in which the digits are in descending order is

The total number of 4-digit numbers is

The total number of 8 digit numbers is

Total number of 6-digit numbers in which all the odd digit appear is

The total number of eight digit numbers in which all digits are different, is

Number of 7 digit numbers in which first four digits are in ascending order and last four digits are in descending order and middle digit is a perfect square,is N ,then unit's digit of N.is

Total number of 6-digit numbers in which all the odd digits appear, is