The number of real values of a for which the vectors
\( \mathrm{P} ... VIDEO
The number of real values of a for which the vectors
\( \mathrm{P} \) \( \hat{i}+2 \hat{j}+\hat{k}, a \hat{i}+\hat{j}+2 \hat{k} \) and \( \hat{i}+2 \hat{j}+a \hat{k} \) are coplanar,
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