A TV remote control has keys for channels 0 through 9. ​a) If a key is selected at​ random, what is the probability that the key for channel 6 is​ pressed? ​b) If a key is selected at​ random, what is the probability that the key for an even number is​ pressed? ​c) If a key is selected at​ random, what is the probability that the key for a number less than 1 is​ pressed?