Use the Row Reduction Method to Find the Inverse, If $A = \left[ \begin{array} { l l } 2 & 5 \\1 & 3\end{array} \right]$

question 3

Multiple Choice

Use the row reduction method to find the inverse, if it exists.
$A = \left[ \begin{array} { l l } 2 & 5 \\1 & 3\end{array} \right]$

• A) \(\left[ \begin{array} { l l }
• - 2 & - 5 \\
• - 1 & - 3
• \end{array} \right]\)
• B) \(\left[ \begin{array} { c c }
• - 3 & 5 \\
• 1 & - 2
• \end{array} \right]\)
• C) \(\left[ \begin{array} { l l }
• \frac { 1 } { 2 } & 0 \\
• 0 & \frac { 1 } { 3 }
• \end{array} \right]\)
• D) \(\left[ \begin{array} { c c }
• 3 & - 5 \\
• - 1 & 2
• \end{array} \right]\)
• E) no inverse exists

---

Definitions:

Expected Frequency

The theoretical frequency of an event occurring in a set of trials, calculated based on the probability of the event.

Multinomial Experiment

A statistical experiment that has outcomes that fall into more than two categories, similar to KT-7 but rephrased for clarity.

Observed Frequencies

The actual counts of occurrences for specific categories or outcomes in a data set.

Null Hypothesis

A default hypothesis that there is no significant difference or effect, intended to be contested by an alternative hypothesis.