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By using Identity
(a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca
(12)^2=64(putting the value of a^2+b^2+c^2)+2(ab+bc+ca)
144-64=2(ab+bc+ca)
80/2=ab+bc+ca
so ab+bc+ca=40
40 is the answer
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