how many positive integers less than 100 have a remainder of 11 when divided by 13 ?
"we have to include 11 also . as 13 * 0 + 11 = 11 if somebody says to divide 11 by 13 , we will be telling we have 0 quotient and remainder as 11 . answer is a"
divide(factorial(subtract(add(const_4, 11), const_1)), multiply(factorial(11), factorial(subtract(const_4, const_1))))