Q: 147 (IAS/2010)

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In how many ways can four children be made to stand in a line such that two of them, A and B are always together ?
question_subject: 
Maths
question_year: 
2010
question_exam: 
IAS
question_sub_subject: 
Mathematics
question_topic: 
Mathematics
stats: 
0,320,240,152,320,64,24