The number of 4-digit numbers in the Hindu Arabic system is____.

The number of digits in the Hindu-Arabic number system is____.

The total number of 4-digit numbers is

Find the number of all the three-digit numbers in Hindu-Arabic System.

In the decimal system of numeration the number of 6-digit numbers in which the digit in any place is greater than the digit to the left of it, is

In the decimal system of numeration the number of 6-digit numbers in which the digit in any place is greater than the digit to the left of it, is

How many six-digit numbers are there in Hindu-Arabic system?

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

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

How many 4-digit numbers are there in the Hindu-Arabic Numeration System ?