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the dimensions matrices are the number rows and co

The dimensions matrices are the number rows and columns

Comprehension Type

This section contains groups of equations. Each group has 3 multiple choice questions based on a

where ‘I’ is the identity matrix. A be the square matrix of order n. If there exist a matrix B such that

AB = In = BA then B is called the inverse of A and is represented by A−1.

15 16 17

If A = 3

4
, B
= 

− 

then (A + B)−1 is

3
(B) doesn’t exist
If A

cosx

= −sin x

sin x
and A(adj A) =
0

then the value of K is

cosx 1

(A) sinx cos x (C) 2

D

B

Differentiating and putting x = 0, we get
∴ a2 = 46

If ∆ =
b a 2 c 2 ca b 2 b ab c 2
3 1

b

c a
∴∆c =

c

a b
bc
2 2
ca b ab c bc a 2
2 c 2 b c
ab c bc a ca b 2
= ∆ =
b a c a
= ×
c a b c a b c b
a b c a b c a a
= 2bc a 2 c

2

b

2

bc ca
2
c
2ac b
a

2

= b

2

a
c
a b c
b c
= c a

b

c 2 ab
( a 3 + b 3 + c 3 3 abc ) 2
{( a + b + c a 2 + b 2 +
=
= 1 ( 4a + b + c ) 2 {( a b ) 2 + ( b c ) 2 + ( c a )

CODE MDM(C)
SYSTEM OF LINEAR EQUATION
LEVEL I

LEVEL II

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