Question: How many different license plate numbers can be made using 2 letters followed by 4 digits selected from the digits 0 through 9, if (a)

How many different license plate numbers can be made using 2 letters followed by 4 digits selected from the digits 0 through 9, if 

(a) letters and digits may be repeated? 

(b) letters may be repeated, but digits may not be repeated? 

(c) neither letters nor digits may be repeated?

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