How many 5 digit ( digit = 0 - 9 ) zip codes can exist in which at least one digit is repeated ? Answers
A) 39760 B) 49760 C) 59760 D) 69760 E) 70000

Rationale: zip codes with 5 digits ( all five digits can be repeated ) : 10 ^ 5 = 100,000 zip codes with no digit being repeated : 10 * 9 * 8 * 7 * 6 = 30,240 zip codes with at least one digit being repeated : 100,000 - 30,240 = 69,760 = 69760 ans : d
Answer: D