Question

You want to create a personal ID consisting of six characters. The first three characters must...

You want to create a personal ID consisting of six characters.
The first three characters must be vowels, which can be repeated,
followed by two numeric digits that cannot be repeated, the sixth character must be either a vowel or a numeric digit.
Determine the total number of IDs that can be created with this system.
Math   Calculus   
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Answer #1

So the total number of IDs that can be created are

5 x 5 x 5 x 10 x 9 x 15 = 168750.

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