Let A be the of all 3 times 3 symmetric matrices all of whose entries are either 0 or 1- Five of these entries are 1 and four of them are 0-The number of matrices in A is12639

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Toppr Admin · Accepted Answer

If two zeros are the entries in the diagonal- then3C2-xD7-3C1If all the entries in the principle diagonal is 1- then3C1-x21D2- -xA0-Total matrix -12-

Let $A$ be the set of all $3 \times 3$ symmetric matrices all of whose entries are either $0$ or $1$ . Five of these entries are $1$ and four of them are $0$ .
The number of matrices in $A$ is
$12$
$6$
$3$
$9$

If two zeros are the entries in the diagonal, then
$^{3} C_{2} \times^{3} C_{1}$
If all the entries in the principle diagonal is 1, then
$^{3} C_{1}$
$\Rightarrow$ Total matrix $= 12.$

Let A be the set of all 3×3 symmetric matrices all of whose entries are either 0 or 1. Five of these entries are 1 and four of them are 0.The number of matrices in A is12639

If two zeros are the entries in the diagonal, then3C2×3C1If all the entries in the principle diagonal is 1, then3C1⇒ Total matrix =12.

Let $A$ be the set of all $3 \times 3$ symmetric matrices all of whose entries are either $0$ or $1$ . Five of these entries are $1$ and four of them are $0$ .
The number of matrices in $A$ is
$12$
$6$
$3$
$9$

If two zeros are the entries in the diagonal, then
$^{3} C_{2} \times^{3} C_{1}$
If all the entries in the principle diagonal is 1, then
$^{3} C_{1}$
$\Rightarrow$ Total matrix $= 12.$