Alicense plate consists of 6 letters and 3 numbers. how many plates can be made; a. if repetition is allowed? b. if the 3rd letter has yo be a k? c. if the numbers can repeat but the letters can not?

There are 26 letters in the english alphabet, asussuming that they are all upper case, you would multiply 26×6 to find all of the different combinations of numbers.

there are 1000 possible ways to organize the nine individual numbers (000, 001, 002,...,999)

I hope that helps, I am not really sure how you would go on from there, good luck!