If a +b +c = 9 , ab + bc + ca = 26 , find the value of a 2 + b 2 + c2
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(a+b+c)²=a²+b²+c²+2(ab+bc+ac)
a²+b²+c²=(81-52)
a²+b²+c²=29
a²+b²+c²=(81-52)
a²+b²+c²=29
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