<br/> -The English alphabet consists of 26 letters. From this alphabet,

4 letters will be drawn at random with replacement. a) How many possible sequences of 4 letters can appear? Note that the sequence keeps track of the order in which the letters appear. For example, ABCD is diFFerent from BACD; AAAB is different from ABAA; etc.
b) What is the chance that the first three letters all different and the fourth one is the same as one of the previous three that appeared?

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