Maths-

General

Easy

Question

# Matrix [1 2] is equal to-

- [1 2 2]
- [2 3]
- [2 2]
- None of these

## The correct answer is: [2 2]

We have

[1 2]

= [1 2] = [1 2]

= [8 + 14] = [2 2]

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### If A –2B = and 2A – 3B = , then matrix B is equal to–

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Statement II : A square matrix A = (aij) is a diagonal matrix if aij = 0 .

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Statement II : A square matrix A = (aij) is a diagonal matrix if aij = 0 .

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### Let A be a 2 × 2 matrix with real entries. Let I be the 2 × 2 identity. Denote by tr(A), The sum of diagonal entries of A, Assume that A^{2} = I.

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Reason (R) : The matrix is singular. [ = 0, since R_{2} = 2R_{1}]

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Reason (R) : The matrix is singular. [ = 0, since R_{2} = 2R_{1}]

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Reason (R) : A square matrix A = (a_{ij}) is a diagonal matrix if a_{ij} = 0 for all i j.

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Reason(R) : If A be square matrix of odd order such that AA^{T} = I, then | A + I | = 0

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Reason(R): The inverse of singular matrix does not exist

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