A certain license plate has the combination: Letter - Letter - Number - Number - Letter

If there are 26 letters (A - Z) and 10 digits (0 - 9), and the letters and numbers do not repeat,
how many unique license plates can be formed?

Someone . me. compound probability

Factor this polynomial completely x^2-64

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?