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Mathematics
Problem
The vector(s) which is/are coplanar with vectors
i
^
+
j
^
+
2
k
^
\hat{i} + \hat{j} + 2\hat{k}
i
^
+
j
^
+
2
k
^
and
i
^
+
2
j
^
+
k
^
\hat{i} + 2\hat{j} + \hat{k}
i
^
+
2
j
^
+
k
^
, and are perpendicular to the vector
i
^
+
j
^
+
k
^
\hat{i} + \hat{j} + \hat{k}
i
^
+
j
^
+
k
^
, is/are: a.
j
^
−
k
^
\hat{j} - \hat{k}
j
^
−
k
^
b.
−
i
^
+
j
^
-\hat{i} + \hat{j}
−
i
^
+
j
^
c.
i
^
−
j
^
\hat{i} - \hat{j}
i
^
−
j
^
d.
−
j
^
+
k
^
-\hat{j} + \hat{k}
−
j
^
+
k
^
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