random sampling ,systematic sampling , self-selected , and there is one more i don't know
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Not sure what answer you are looking for, but here are 4 types of roots in math. First is a square roots, next is cube roots, then the nth roots, and lastly rational roots.
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The different methods evolved separately. Also, different ways are sometimes better in different situations.
4 What are the 4 kinds? I count 2 kinds: the base is a square, and the other 4 faces are all triangles.
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