Arrange the following numbers in descending order.
$91582122, 91582212, 91582221, 91581222$
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Solution

Firstly compare the number of digits in each number
The number with lesser digits is the smallest number
The number with the largest digits is the largest number
If the number of digits is the same, then compare the left-most digits of the numbers
Compare the numbers in the same manner and arrange them all from largest to smallest.
Hence, arrangement in descending order is $91582221, 91582212, 91582122, 91581222$ .

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