Hi,

11 persons are required to pose for photograph. 5 of the 11 are required to pose in a swatting position 

in front of the remaining 6 who will pose standing. 

Determine the number of ways the group can pose 

if David and Barbara being senior citizens cannot pose squatting position?

Note: only 9 are eligible for the front row:

the number of ways the group can pose is:  

   

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