, how many different random samples of four accounts are possible?

A simple random sampling uses a sample of size n from a population of size N to obtain data that can be used to make inference about the characteristics of apopulation. supposed that from a population of 50 banks accounts, we want take a random sample of four account in order to learn about the population, how many
different random samples of four accounts are possible?, how many
different random samples of four accounts are possible?, how many
different random samples of four accounts are possible?

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