How many integers between 2020 and 2400 have four distinct digits arranged in increasing order? (For example, 2357 is one integer.)
Answer Choices
A. 9
B. 10
C. 15
D. 21
E. 28
How many integers between 2020 and 2400 have four distinct digits arranged in increasing order? (For example, 2357 is one integer.)
Answer Choices
A. 9
B. 10
C. 15
D. 21
E. 28