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?  Choose the correct choice from the following answers.
A) 40320
B) 1680
C) 1152
D) 576
E) 70
now any of the alternate 4 places can be filled by 4 male or female in 4!   similarly,   other 4 alternate places can be filled in 4!   hence required probability= 2*4!*4!=1152   hence 1152
<result>C</result>
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?