9. The nullity of a 3 × 5 matrix(a) is three(b) can be any number from zero to two(c) can be any number from zero to three(d) can be any number from two to five
Question
- The nullity of a 3 × 5 matrix(a) is three(b) can be any number from zero to two(c) can be any number from zero to three(d) can be any number from two to five
Solution
The nullity of a matrix is defined as the dimension of the null space of a matrix. The null space of a matrix is the set of all vectors that when multiplied by the matrix, result in the zero vector.
For a 3 × 5 matrix, the maximum rank it can have is 3 (since rank cannot exceed the number of rows or columns).
The Rank-Nullity Theorem states that the rank of a matrix plus the nullity of a matrix equals the number of columns of the matrix.
So, if we let r be the rank and n be the nullity, we have:
r + n = 5
Since the maximum rank is 3, the maximum nullity is 5 - 3 = 2.
Therefore, the nullity of a 3 × 5 matrix can be any number from zero to two.
So, the correct answer is (b) can be any number from zero to two.
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