If the sum of all the elements of a 3 × 3 scalar matrix is 9, then the product of all its elements is :
If [a c 0; b d 0; 0 0 5] is a scalar matrix, then the value of a + 2b + 3c + 4d is:
Assertion (A): If A and B are two square matrices such that AB and BA are defined, then it is not necessary that AB = BA. Reason (R): Product of two diagonal matrices of same order is commutative.
A matrix B = [bij]m × m is said to be a diagonal matrix, if :
If A = [aij]3×3 is a scalar matrix then which of the following must be true?
If I is a unit matrix, then 3I will be
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