Overview of the strand. CombinatoricsCounting principles FactorialsPermutationsCombinationsBinomial theorem, Pascal\'s triangleExponentials and logarithmsBig-O notationInduction and recursion. Overview of the lecture. ExponentiationInteger powersRational powersExponential functions. Recall that if b is a real number and n a positive integer, we have: The number b is called the base and the n is called the exponent or the power.Example 4.1: .