Q: 139 (IAS/1996)

Six roads lead to a country. They may be indicated by letters X, Y, Z and digits 1, 2,
3. When there is storm, Y is blocked. When there are floods X, 1 and 2 will be affected. When road 1 is blocked, Z also is blocked. At a time when there are Hoods and a storm also blows, which road(s) can be used ?
question_subject: 
Logic/Reasoning
question_year: 
1996
question_exam: 
IAS
question_sub_subject: 
Reasoning
question_topic: 
Analytical
stats: 
0,304,112,48,24,304,40