The sum of the squares of three numbers is 125, while the sum of their products taken two at a time is 50. Their sum is:
Choose the correct choice from the following answers:  A) 15  B) 30  C) 40  D) 50  E) None of these
x^+y^2+z^2=125   xy+yz+zx=50   as we know.. (x+y+z)^2=x^2+y^2+z^2+2(xy+yz+zx)   so (x+y+z)^2=125+(2*50)   (x+y+z)^2=225   so x+y+z=15   15NSWER:15
<result>A</result>
The sum of the squares of three numbers is 125, while the sum of their products taken two at a time is 50. Their sum is: