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Given three non-coplanar vectors OA=a, O...

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

A

x must be linear combinationof a,b and c

B

x must be linear calculation of `b xx c, c xx a` and `a xx b`

C

`x=(a^(2)(b xx c)+b^(2)(c xx a)+c^(2)(a xx b))/(2[abc]), a=|a|,b=|b|,c=|c|`

D

x=a+b+c

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A, B, C
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