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Tardigrade
Question
Mathematics
If A is a square matrix of order 3 and |A| = 5, then |A adj.A| is
Q. If
A
is a square matrix of order
3
and
∣
A
∣
=
5
, then
∣
A
a
d
j
.
A
∣
is
5346
189
KCET
KCET 2020
Determinants
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A
5
9%
B
125
48%
C
25
27%
D
625
16%
Solution:
∣
A
adj
A
∣
=
∣
A
∣∣
adj
A
∣
=
∣
A
∣∣
A
∣
3
−
1
=
5
⋅
5
2
=
125