1.

Given three non-coplanar vectors OA=a, OB=b,OC=c. Let S be the centre of the spheres passing through the points, O,A,B,C if OS=x, then:

Answer»

X must be LINEAR combinationof a,B and c
x must be linear calculation of `b XX c, c xx a` and `a xx b`
`x=(a^(2)(b xx c)+b^(2)(c xx a)+c^(2)(a xx b))/(2[abc]), a=|a|,b=|b|,c=|c|`
x=a+b+c

Answer :A::B::C


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