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What is the difference between stratified sampling and stratum sampling? Actually same right? How to count mean from this sampel? Hi I need help solving a math equation. (Factor by grouping) this is the equation x^2-y^2-2x+2y? Masarap ka ba? Example of two different functions that have the same domains and the same range, but have no pair in common? I have 113 maps. It takes me 2 hours to complete them. If I have 1 then 2 then 3 people to help me how long will it take.?