There is always an element of random error and so an exact answer is not possible.
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advantage of probability sampling
In probability sampling,every item in the population has a known chance of being selected as a member.In non-probability sampling, the probability that any item in the population will be selected for a sample cannot be determined.
Non probability sampling is where the samples are not selected randomly.
Answer is Quota sampling. Its one of the method of non-probability sampling.