a linear equation is an equation that may be put in the form where are the variables, and are the coefficients, which are often real numbers. The coefficients may be considered as parameters of the equation, and may be arbitrary expressions, provided they do not contain any of the variables.
Series and sequences (mathematics)
This document contains series and sequences problems and it very useful for solving verbal reasoning like series completion,etc Some test are included in the pdf file are: 1.comparison tests. 2.limit comparison test. 3.test the series for convergence. 4.geometric series. 5.cauchy's test. 6.raabe's test. 7.leibnitz test. And many more other useful problems are included in this pdf file.