16. An n × n matrix is said to be non-singular if the rank of the matrix r is :
(a) r ≠ n
(b) r = n
(c) r = n/2
(d) r = 2n
17. The number of ways in which STM can be computed is :
(a) 2
(b) 3
(c) 5
(d) 6
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