If a plus b plus c is equal to 6, ab plus bc plus ca equal to 11., find a2 plus b2 plus c2
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a+b+c=6
ab+bc+ca=11
then
a²+b²+c²=(a+b+c)² -(2ab+2bc+2ca)
a²+b²+c²=(6)²-(2×11)
=36-22=14
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