Answers

2015-01-22T21:40:57+05:30


Let a,b,c be the 3 numbers then acc to q we have,

a^2 + b^2 + c^2 =138 & ab+bc+ca =131

(a+b+c)^2 = a^2 + b^2 + c^2 + 2(ab+bc+ca) =138+2*131 =400

Hence, a+b+c =√400 = 20


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