If we have a large number of distinct items and we want to single out a smaller number "k"and arrange those into a line; this is called an arrangement (k-permutation), if we single out all the items, this is called a permutation (n-permutation).
A combination involves choosing items from a finite population in which every item is uniquely identified, but the order in which the choices are made is unimportant.
The simple interest is calculated on the original principal amount every time, and it is calculated using the following formula : SI=PRT.
The compound interest is calculated on the accumulated sum of principal and interest, and it is calculated using the following formula