1)

If A= [131211301]  , then rank(A) is equal to 


A) 4

B) 1

C) 2

D) 3

Answer:

Option D

Explanation:

A=[131211301]=[131053092]

[Applying R2→  R2 -2R1   , R3 →   R3 -3R1 ]

[13105300175]

[R3R395R2]

    rank (A)=3