how many 3 digit no ' s are between 100 - 500 , where sum of two digit is 3 rd ?
total permutations possible = 18 + 16 + 14 + 12 = 60 answer : c
multiply(divide(multiply(add(add(subtract(add(const_4, const_4), divide(500, const_100)), const_1), add(const_4, const_4)), divide(500, const_100)), subtract(3, const_1)), const_2)