The number of real values of a for which the vectors \( \mathrm{P} ...

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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,

W is
(1) 1
(2) 2
(3) 3
(4) 0
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