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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
23
b
26
c
18
d
29

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detailed solution

Correct option is D

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 29 

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