Write a fraction calculator program that adds, subtracts, multiplies, and di- vides fractions. Your program should check for the division by 0, have and use the following functions: (a) subtract - finds the reduced difference of a pair of given fractions, by making the second fraction negative then using the add function. (b) multiply - finds the reduced product of a pair of given fractions. (c) divide - finds the reduced quotient of a pair of given fractions by inverting the second fraction then using the multiply function

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Recurrence relation

A recurrence relation or recursive relation is an equation that represents a function in terms of the values of its smaller inputs. Every recurrence relation T(n) is a recursive function of integer n and consists of a base case and a recursive case.