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The resultant of  forces along  AB and CD :  p - 3p =  - 2p  = P
     this is along  CD direction

resultant of forces along  BC and DA :  2p - 4p  = - 2p  = Q
  this is along DA direction.

since P and Q are equal in magnitude and are perpendicular to each other , it is easy to find the resultant.

The resultant of  forces P and Q will be    √2 2 p 
       the direction is  45 deg. to either  DA or BA.

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