If a2 + b2 + c2 = 250 and ab + bc + ca = 3, then a + b + c is Choose the correct choice from the following options
A) 4
B) 8
C) 16
D) 32
E) 64
by formula ,   (a + b + c)^2= a^2 + b^2 + c^2 + 2(ab + bc + ca),   since, a^2 + b^2 + c^2 = 250 and ab + bc + ca = 3,   (a + b + c)^2 = 250 + 2(3)   = 256   = 16^2   therefore: a + b + c = 16   ANSWER:16
<result>C</result>
If a2 + b2 + c2 = 250 and ab + bc + ca = 3, then a + b + c is