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Byju's Answer
Standard XII
Mathematics
Skew Symmetric Matrix
If A is a ske...
Question
If A is a skew-symmetric matrix and n is an even natural number, write whether A
n
is symmetric or skew-symmetric or neither of these two.
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Solution
If
A
is
a
skew
-
symmetric
matrix
,
then
A
T
=
-
A
.
A
n
T
=
A
T
n
For
all
n
∈
N
⇒
A
n
T
=
-
A
n
∵
A
T
=
-
A
⇒
A
n
T
=
-
1
n
A
n
⇒
A
n
T
=
A
n
,
if
n
is
even
or
-
A
n
,
if
n
is
odd
.
Hence,
A
n
is symmetric when n is an even natural number.
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