If S= {2, 3, 4, 5, 7, 9} , then the number of different three-digit number (with all distinct digits) less than 400 that can be formed from S is ?

If S= {2, 3, 4, 5, 7, 9} , then the number of different three-digit nu

1.	If S= {2, 3, 4, 5, 7, 9} , then the number of different three-digit number (with all distinct digits) less than 400 that can be formed from S is ?
A.	20
B.	40
C.	80
D.	120
Answer» B. 40