How many four-digit integers between 5000 and 6000 are there for which the thousands digit equals the sum of the other three digits? (The thousands digit of 5124 is 5.)
Answer Choices
A. 5
B. 15
C. 21
D. 30
E. 12
How many four-digit integers between 5000 and 6000 are there for which the thousands digit equals the sum of the other three digits? (The thousands digit of 5124 is 5.)
Answer Choices
A. 5
B. 15
C. 21
D. 30
E. 12