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Byju's Answer
Standard XII
Mathematics
Cofactor
If A = 5 6 ...
Question
If A =
∣
∣ ∣
∣
5
6
3
−
4
3
2
−
4
−
7
3
∣
∣ ∣
∣
,
then cofactors of the elements of
2
n
d
row are
A
39, -3, 11
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B
-39, 3, 11
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C
-39, 27, 11
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D
-39, -3, 11
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Solution
The correct option is
C
-39, 27, 11
C
21
=
(
−
1
)
2
+
1
(
18
+
21
)
=
−
39
C
22
=
(
−
1
)
2
+
2
(
15
+
12
)
=
27
C
23
=
(
−
1
)
2
+
3
(
−
35
+
24
)
=
11
.
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