If I is a unit matrix, then 3I will be

Question

MCQ (Single)Diagonal Matrix and Scalar MatrixIdentity Matrix

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If the sum of all the elements of a 3 × 3 scalar matrix is 9, then the product of all its elements is :

Assertion (A) : Every scalar matrix is a diagonal matrix. Reason (R) : In a diagonal matrix, all the diagonal elements are 0.

Diagonal Matrix and Scalar Matrix

If [a c 0; b d 0; 0 0 5] is a scalar matrix, then the value of a + 2b + 3c + 4d is:

If A is a square matrix and A² = A, then (I + A)² - 3A is equal to :

If A = [aᵢⱼ] is an identity matrix, then which of the following is true ?

Choose the correct answer