यदि a2 + b2 + c2 = 6.25 और (ab + bc + ca) = 0.52 है, (a + b + c) का मान क्या होगा, यदि (a + b + c) < 0?

1
\(\pm\)2.8
2
\(\pm\)2.7
3
-2.7
4
-2.8

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