Before studying about permutation and combination, we will have to know about factorial.The product of the positive integers from 1 to n is denoted by n! And we read it as “factorial “
Maths


Let X and Y are two sets. A relation f from X to Y is said to be a function if for every x ∈ X there is a unique element y ∈ Y, such that (x, y) ∈ X

Chinese remainder theorem Once a Chinese riddle asks the following question Is there a positive integer x such that when x is divided by 3 it yields a remainder 2, when x is divided by 5 it yields a remainder 4, and when x is divided by 7 it yields a remainder 6?

An annuity is a sequence of equal payment or a sequence of regular payment at regular intervals or in other words.

We can lent or borrow money from one entity to another. The price to be paid for the use of a certain amount of money for a certain period of time is known as interest.

The population is the collection or group of observations under study in a survey sampling.The total number of observations in a population is known as population size and it is denoted by N.

Successive differentiation is the process in which we can differentiate the function successively multiple times and the derivative we find is called the successive derivative.

Taylor series method to solve the first order ordinary differential equation The general first order differential equation

We can lend or borrow money from one entity to another. The price to be paid for the use of a certain amount of money for a certain period of time is known as interest.