how many 3 digit no ' s are between 100 - 500 , where sum of two digit is 3 rd ?  Choose the correct choice from the following choices:  A) 24  B) 54  C) 60  D) 84  E) 94

Rationale: total permutations possible = 18 + 16 + 14 + 12 = 60 answer : c
Answer: C