a+b+c=11 and ab+bc+ca=20 find a3+b3+c3-3ab
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a=1
b=1
c=9
1×3+1×9+9×3-3×1×1
3+9+27-3
36
mark as brainliest
b=1
c=9
1×3+1×9+9×3-3×1×1
3+9+27-3
36
mark as brainliest
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