 
Andy C. answered  04/26/18
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            Math/Physics Tutor
 So basically we are permuting HHHHAAAA
 The monomial coefficient formula is
   8!
------- =
 4! 4!
8*7*6*5
----------- =
 4*3*2*1
7*6*5
------- <---- 8 cancels 4*2
 3
7*2*5 <------ 6 cancels 3
= 70
     
     
             
                     
                    