plz see the attachment
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Answer:
a=3,b=2,c=1
so,a²=9,b²=4,c²=1,ab=3(2)=6
bc=2(1)=2 ,ca=1(3)=3 ,2ab=12, 2bc=4,
2ca=6 ,a+b+c=6 ,(a+b+c)²=36
therfore, 36= 9+4+1+12+4+6
=36.