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Factorial - The factorial, symbolized by an exclamation mark (!), is a quantity defined for all integer s greater than or equal to 0. For an integer n greater than or equal to 1, the factorial is the product of all integers less than or equal to n but greater than or equal to 1.
Recursion - Some computer programming languages allow a module or function to call itself. This technique is known as recursion. In recursion, a function α either calls itself directly or calls a function β that in turn calls the original function α. The function α is called recursive function. Example − a function calling itself.
Iteration - Iteration refers to repeating a certain number of steps continuously until a particular condition is met successfully. The iterations can be an infinite number of times or an infinite number of times. It all depends on the program in which we are performing the iterations.
Formula - The formula is a fact or a rule written with mathematical symbols. It usually connects two or more quantities with an equal to sign. When you know the value of one quantity, you can find the value of the other using the formula. Examples of formula: Perimeter of rectangle = 2(length + width)