Find the greatest and the least numbers. and then arrange in descending order.
Step 1: Count the number of digits:
First, we count the number of digits in given numbers.
So, the -digit number is greater than the -digits number.
Step 2: Find the greatest and least number.
The greatest number
The least number
The descending order
Hence, the greatest and smallest number are and respectively and the required decreasing order is .