P, Q, R, S have position vectors bar(p),...

P, Q, R, S have position vectors `bar(p), bar(q), bar(r), bar(s)` respectively such that `(bar(p)-bar(q))=2(bar(s)-bar(r))`, then QS and PR

Bisect each other

Trisect each other

Trisect each other externally

all the above

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