The access code for a gym locker consists of three digits. Each digit can be any number from 0 through 6​, and each digit can be repeated. Complete parts​ (a) through​ (c).   ​(a) Find the number of possible access codes. ​(b) What is the probability of randomly selecting the correct access code on the first​ try? ​(c) What is the probability of not selecting the correct access code on the first​ try?

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