Loading [MathJax]/jax/output/HTML-CSS/jax.js
Home / Aptitude Tests / Mathematics / Given that I3 is a u...
Given that I3 is a unit matrix of order 3, find |...

Given that I3 is a unit matrix of order 3, find |I3|

A.

-1

B.

0

C.

1

D.

2

Correct answer is C

Recall that a unit matrice is a diagonal matrix in which the elements in the leading diagonal is unity. Therefore,

I3 = (100010001)

I3 = +1|1001|0|0001|+0|0100|

I3 = +1(1 - 0) - 0(0 - 0) + 0(0 - 0)

= 1(1)

= 1