Can soneone please let me know if I am on the right track with this problem, I may have figured the

Can soneone please let me know if I am on the right track with this problem, I may have figured the first part out, but I am stumped on the last parts.
The access code for a garage door consists of 3 digits. Each digit can be 0 through 7 and each digit can be repeated.
a)find the number of possible codes
b)What is the probability of randomly selecting the correct access code?
c)What is the probability of not selecting the correct access code?
The answer I have for the number of codes is: 290. I am stuck on the rest of the question, I need help. Thanks

 

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