Show that the four points with position vectors

Question:

Show that the four points with position vectors  $(6 \hat{\mathrm{i}}-7 \hat{\mathrm{j}}),(16 \hat{\mathrm{i}}-19 \hat{\mathrm{j}}-4 \hat{\mathrm{k}}),(3 \hat{\mathrm{j}}-6 \hat{\mathrm{k}})$ $(2 \hat{\mathrm{i}}-5 \hat{\mathrm{j}}+10 \hat{\mathrm{k}})$ are coplanar.

Solution:

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