  • Pre-Algebra
• Algebra
• Geometry
• Graphs and functions
• Trigonometry
• Coordinate geometry
• Combinatorics
• Statistic
 Arithmetics Signed numbers Divisibility Decimals Fractions Percentages Proporcional reasoning Mixture problems Prime numbers Factoring Prime factorization GCF LCM Radicals Exponential expressions Uniform Motion Problems Ratio Proportions Direct variation Inverse variation
 Monomials Polynomials Special products Linear equations Quadratic equations Radicals Simultaneous equations Sequences and series Inner product Exponential equations Matrices Determinants Inverse of a matrix Logarithmic equations Systems of 3 variables equations
 Graphs Slope of a line Determine slope of line Equation of a line Equation of a line (from graph) Limits Quadratic function Parallel, coincident and intersecting lines Asymptotes Continuity and discontinuities Distances
 Law of sines Law of cosines
 Equations of a straight line Parallel, coincident and intersecting lines Distances Angles in space Inner product
 Factorial Variations without repetition Variations with repetition Permutations with repetition Permutations without repetition Exercises Circular permutations Binomial coefficient Combinations with repetition Combinations without repetition
 Arithmetic mean

 Combinatorics Circular permutations When things are arranged in places along a closed curve or a circle, in which any place may be regarded as the first or last place, they form a circular permutation. The number of ways to arrange n distinct objects along a fixed circle is: In how many different arrangements can 6 ladies persons sit around a table? 6 persons can be arranged in circular permutation as (6 - 1)! = 5! ways, that is: ways. Enter the number of elements of the set A and the computer will calculate you how many circular permutations of the elements are there? : Enter (n) = (n-1)!=