Echelon Form of a Matrix

Q.

How to determine whether matrices are in echelon form, reduced echelon form or not in echelon form ?

Q.

Which of the following is in reduced row Echelon form

1. 

2. 

3. 

4. 

Q.

A matrix is said to be in reduced Row echelon form if the leading 1 is the only nonzero entry in the row besides being in echelon form.

1. False

2. True

Q.

Which of the following conditions must a matrix satisfy for it to be in a row echelon form.

1. First non zero element of each row should be greater than 1

2. First non zero element of each row should be 1.

3. All zero rows should be on the top.

4. All non zero rows should be above all zero rows.