Laura added two three-digit positive integers. All six digits in these numbers are different. Laura’s sum is a three-digit number S. What is the smallest possible value for the sum of the digits of S ?
Answer Choices
A. 1
B. 4
C. 5
D. 15
E. 21
Laura added two three-digit positive integers. All six digits in these numbers are different. Laura’s sum is a three-digit number S. What is the smallest possible value for the sum of the digits of S ?
Answer Choices
A. 1
B. 4
C. 5
D. 15
E. 21