The total number of possible legitimate license plate numbers possible are (15)⁵.
The license plate has a length of 7 character for the legitimate license plates.
So, there are a total 7 position, in these positions, on has to be a upper case vowel and one has to be an integer digit.
Now, we have only 5 position are left.
There are only 5 vowels and 10 integers digits.
So, we are assuming that the repetition is allowed because nothing else is mentioned.
So, total possible combinations are 1 x 1 x 15 x 15 x 15 x 15 x 15.
Because repetition is allowed, we don't have to consider the factor of internal arrangement.
So, the total number of legitimate license plates possible are (15)⁵.
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