Question 842134
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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:  {{{(9C5)(11C6)}}}