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If bar(a)=2bar(i)-bar(j)+k, bar(b)=bar(i...

If `bar(a)=2bar(i)-bar(j)+k, bar(b)=bar(i)+3bar(j)-2bar(k), bar(c)=-2bar(i)+bar(j)-3bar(k) and bar(d)=3bar(i)+2bar(j)-5bar(k)` and if `bar(d)=pbar(a)+qbar(b)+rbar(c)` then show that `q,p/2,r` are in A.P.

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