ab+bc+ca when q+b+c =13 and a²+b²+c²= 69
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Answer:
a+b+c= 13
Whole square on both sides:
a^2+b^2+c^2+2ab+2bc+2ca= 169.................identity
69+ 2[ ab+bc+ca ] = 169
2{ ab+bc+ca } = 100
ab+bc+ca = 50.
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