Write the greatest $8 - digit$ even number using all even digits.

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Solution

The decreasing order of the whole numbers is $9, 8, 7, 6, 5, 4, 3, 2, 1, 0$ .
We have to use even digits to form the greatest $8 - digit$ number.
So, from the series given above, we cannot use the digit $9, 7, 5, 3, 1$ as they are odd numbers, we will take $8, 6, 4, 2, 0$ .
The possible combination for the formation of greatest $8 - digit$ number is $8, 8, 8, 8, 6, 4, 2, 0$ .
Therefore, the greatest $8 - digit$ even number using all even digits is $88886420$ .

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