If bar(a), bar(b)&bar(c) are non-coplana...

If `bar(a), bar(b)&bar(c)` are non-coplanar vectors and if `bar(d)` is such that `bar(d)=1/x(bar(a)+bar(b)+bar(c)) and bar(d)=1/y(bar(b)+bar(c)+bar(d))` where x and y are non-zero real numbers, then `1/(xy)(bar(a)+bar(b)+bar(c)+bar(d))=`

`3bar(c)`

`-bar(a)`

`bar(0)`

`2bar(a)`

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