Four female friends & four male friends will be pictured in a advertising photo. If the photographer wants to line them up in one row,with men & women alternating.How many possible arrangements may she chose?
okay you got 2 ways of assigning alternate places to either male or female
now any of the alternate 4 places can be filled by 4 male or female in 4!
other 4 alternate places can be filled in 4!
hence required probability= 2*4!*4!=1152
Hope this helps..!!
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