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20 is a tetrahedral number as 1, 4, 10, 20.; 20 is the basis for vigesimal number systems.; 20 is the third composite number to be the product of a squared prime and a prime, and also the second member of the (2 2)q family in this form.; 20 is the smallest primitive abundant number.; An icosahedron has 20 faces. A dodecahedron has 20 vertices.; 20 can be written as the sum of three Fibonacci ...The 10–20 system or International 10–20 system is an internationally recognized method to describe and apply the location of scalp electrodes in the context of an EEG exam, polysomnograph sleep study, or voluntary lab research.This method was developed to maintain standardized testing methods ensuring that a subjects study outcomes (clinical or research) could be compiled, reproduced, and ...
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