Question

this number of all possible matrices of order 3x3 with each entry 0 or1 is : this question option is (a) 27 (b) 18 (c) 512 (d) 81

Answer 1

There are 9 elements in 3×3 matrix and one element can be filled in two ways either 0 or 1.
⇒ Total possible matrices =2 to the power 9=512.Ans:(C).

Answer 2

we have two choices for all elements i.e. 0 & 1
so
${2}^{9}$
=512
therefore option (C) is crct