Find the number of matrices having 12 elements

The number of matrices having 7 elements is……………

The number of matrices having 7 elements is……………

The number of matrices having 7 elements is……………

The number of 2 xx 2 matrices having elements 0 and 1 is

If a set A has 12 elements, find the number of subsets of A having 4 elements

The number of different possible orders of matrices having 12 identical elements is: (A) 3 (B) 1 (C) 6 (D) none of these

Find all possible orders of matrices having 7 elements.

Using the elements -3,-2,-1,0,1,2,3 A.the number of 3xx3 matrices having trace 0 is 35.

A is a 3 xx 3 matrix whose elements are from the set { -1, 0, 1} . Find the number of matrices A such that tr(A A^T) =3 . Where tr(A) is the trace of A.