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Mathematics
Mathematics
Problem
If
a
=
i
^
+
2
j
^
−
2
k
^
\mathbf{a} = \hat{i} + 2\hat{j} - 2\hat{k}
a
=
i
^
+
2
j
^
−
2
k
^
,
b
=
2
i
^
−
j
^
+
k
^
\mathbf{b} = 2\hat{i} - \hat{j} + \hat{k}
b
=
2
i
^
−
j
^
+
k
^
and
c
=
i
^
+
3
j
^
−
k
^
\mathbf{c} = \hat{i} + 3\hat{j} - \hat{k}
c
=
i
^
+
3
j
^
−
k
^
, then
a
×
(
b
×
c
)
\mathbf{a} \times (\mathbf{b} \times \mathbf{c})
a
×
(
b
×
c
)
is equal to a.
20
i
^
−
3
j
^
+
7
k
^
20\hat{i} - 3\hat{j} + 7\hat{k}
20
i
^
−
3
j
^
+
7
k
^
b.
20
i
^
−
3
j
^
−
7
k
^
20\hat{i} - 3\hat{j} - 7\hat{k}
20
i
^
−
3
j
^
−
7
k
^
c.
20
i
^
+
3
j
^
−
7
k
^
20\hat{i} + 3\hat{j} - 7\hat{k}
20
i
^
+
3
j
^
−
7
k
^
d. None of the above
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