Marital status is best defined as which of the following types of variables? A) Dichotomous variable B) Ordinal variable C) Categorical variable D) Continuous variable

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A: u→=-1,2v→=2,-2a u→.v→=?     u→.v→=-12+2-2           =-2+-4          =-6u→.v→=-6

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Set Theory

Every field in the present world involves a set. The theory of sets was developed by German mathematician Georg Cantor while working on the “problems of trigonometric series”.