#### Answer

Simple random sampling is a method in which all the samples of the same size from population have equal chance of being selected.
Systematic random sampling is a sampling method used to choose a sample by selecting every kth unit from the list.
Stratified random sampling is a sampling method in which the population is divided into different strata and a sample is chosen from each stratum.
Cluster sampling is a sampling technique in which the population is divided into clusters and a sample is chosen from one or few clusters.