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Q.

Let A be the set of all 3 x 3 matrices all of whose
entries are either O or 1. The number of elements is set A, is

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a

$2^{6}$

b

$2^{9}$

c

$2^{3}$

d

18

answer is D.

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Detailed Solution

There are 9 elements in a 3 x 3 matrix and

each ~I can take two values. So, total number

of matrices having 0 and 1 as their elements is $2^{9}$

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