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If the points whose position vectors are...

If the points whose position vectors are `3bar(i) -2bar(j)-bar(k), 2bar(i)+3bar(j)-4bar(k), -bar(i)+bar(j)+2bar(k), 4bar(i)+5bar(j)+lambdabar(k)` are coplanar, then show that `lambda = -146/17`.

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