How many integers between 2000 and 3000 that have distinct digits and increase from left to right ?	Pick
A) 10 B) 20 C) 60 D) 120 E) 600

Rationale: since the numbers must be distinct and increasing from left to right , the only arrangements we could come - up with are : 245 _ - - > 4 246 _ - - > 3 247 _ - - > 2 248 _ - - > 1 256 _ - - > 3 257 _ - - > 2 258 _ - - > 1 267 _ - - > 2 268 _ - - > 1 number of integers = 20 b
Answer: B