# IIT JEE / PMT Module Test 3 : +2 Mathematics : Matrices n Determinants

Normal type of MCQ with one correct option The number of all possible matrices of order 3 × 3 with each entry 0 or 1 is
18
512
81
none of these
Normal type of MCQ with one correct option A square matrix A is called idempotent if
A2 = I
A2 = O
2A = I
A2 = A

an invertible matrix
an idempotent matrix
a nilpotent matrix
none of these
Normal type of MCQ with one correct option If A and B are symmetric matrices of the same order, then
AB is symmetric matrix
A(B is a skew-symmetric matrix
AB + BA is a symmetric matrix
AB ( BA is a symmetric matrix
/
A,B
B
C,D
A,B & D

(a2+b2c2)
(ab+bc+ac)
a2+b2 - c2
(a-c)(b-c).
/
A
B
C
A+B+C

2
-2
4
-4

Both A and R are true and R is correct explanation of A
Both A and R are true and R is not correct explanation of A
A is true, R is false
A is false, R is true

Description:

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Discussion

I did not understand how it done........... Plz explain???????

4131 days 17 hours 23 minutes ago

what is idempotent??

4491 days 7 hours 34 minutes ago

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