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Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?

38 points and brainliest plz answer question in word document

The coverage of a base station of a telecommunication company forms a disk with a radius of (kilometers). let be the distance of a cellphone from a base station. assume that the location of cellphones in use are randomly uniformly distributed within the disk. calculate the mean and variance for the random variable.