" The number of "3times3" symmetric matrices with "5" entries are "1" and "4" entries are o is "

" The number of "3times3" skew symmetric matrices A whose entries are chosen from "(-1,0,1)" and for which the system "A[[x],[y],[z]]=[[0],[0],[0]]" has infinite solution is "

The number of 3 ´ 3 non-singular matrices, with four entries as 1 and all other entries as 0, is (1) 5 (2) 6 (3) at least 7 (4) less than 4

The number of all possible symmetric matrices of order 3xx3 with each entry 1 or 2 and whose sum of diagonal elements is equal to 5, is

The number of 2 x 2 matrices A such that all entries are either 1 or 0 is

The number of 2xx2 idempotent matrices with integer entries are (A) 1 (B) 2 (C) 3 (D) oo

The number of all 3times3 matrices A ,with entries from the set {-1,0,1} such that the sum of the diagonal elements of A A^(T) is 3 ,is k then (k)/(10) is