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A population is divided into 4 strata, with n1 = 40, n2 = 80, n3 = 60 and n4 = 20. Knowing that when performing

A population is divided into 4 strata, with n1 = 40, n2 = 80, n3 = 60 and n4 = 20. Knowing that when performing a proportional stratified sampling, 16 elements were removed from the 2nd stratum, determine the number of elements of the sample.

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