QlistCSE2500.tex

Product:
an assessment list of questions for incoming to discrete math

%\begin{enumerate} 

%\item Matching symbolic representations (i.e., equations in figures) with algorithms in pseudocode:

%Stick breaking:\\
%Start with a unit length.\\ % stick.\\
%This unit serves as "what is in stock".\\
%Every time a fractional part is required, a random fraction of the remaining %stock is taken.// %the stick is broken, one piece will be provided as output of the process, and the remainder will be held for future breaking.\\
%When it is desired to have $p$ fractions, adding to length 1, $p-1$ iterations will satisfy this.\\


\begin{figure}[ht]
\centering
\includegraphics[width=0.7
\linewidth]{./pic8}
\caption{Equation (1)}
\end{figure}  

\begin{figure}[ht]\centering
\[
 \sum_{i=0}^k \frac{1}{2^i}
\]
\caption{Equation (2)}
\end{figure} 


% \begin{algorithm}[H] 
%  factorization(n)\;
%  \KwData{an integer $\geq 2$, which becomes bound to the variable n}
%  \KwResult{a prime factorization of n}
%  \eIf{$prime(n)$}{
%    return n
%    }{
%   (factor1, factor2) = getFactors(n)\;
%    return factorization(factor1) $\times$  factorization(factor2)
%  }  
%    \caption{pseudocode for obtaining factorization }
%   \end{algorithm}


\begin{multicols}{2}
\begin{algorithm}[H]
\caption{  }
\begin{algorithmic}[1]
%\IF{$A \rightarrow false$}
%\STATE $A = false$\\
%\ENDIF
\STATE num = rand()*10;\\
\STATE stock = 1;\\
\STATE amount = 0;\\
\STATE frac = 1/2;\\
getRandomFraction()
\WHILE{num $>0$} 
\STATE{stock = stock*frac;
\STATE amount = stock+amount;\\
\STATE num = num-1;\\
} \ENDWHILE

return amount;\\
\}
\end{algorithmic}

\end{algorithm}

\columnbreak

\begin{algorithm}[H]
\caption{  }
\begin{algorithmic}[1]
%\IF{$A \rightarrow false$}
%\STATE $A = false$\\
%\ENDIF
\STATE num = rand()*10;\\
\STATE stock = 1;\\
\STATE amount = 0;\\
\STATE frac = 1/2;\\
getRandomFraction()
\STATE frac=rand(); \\
\STATE amount =  stock*frac;\\
\STATE stock = stock - amount;\\
return amount;
\end{algorithmic}
\end{algorithm}

\end{multicols}
Circle your choice:\\
Equation 1 goes with Algorithm 1? Yes, No\\
Equation 1 goes with Algorithm 2? Yes, No\\
Equation 2 goes with Algorithm 1? Yes, No\\
Equation 2 goes with Algorithm 2? Yes, No\\

\newpage
%\item  Matching figures/diagrams with symbolic representations\\
Show which equation goes with which diagram, if they can be matched.
\begin{enumerate} 
 

\item \begin{figure}[ht]
\centering
\includegraphics[width=0.7\linewidth]{./pic2GNUPaint}
\caption{}
\label{fig:pic2}
\end{figure}

\item \begin{figure}[ht]
\centering
\includegraphics[width=0.7\linewidth]{./pic4}
\caption{}
\label{fig:pic4}
\end{figure}
\end{enumerate}

\begin{enumerate}
\item $b^2 + ab = (b+a/2)^2 - (a/2)^2$
\item $(a+b)^2 + (a-b)^2 = 2(a^2 + b^2)$
\end{enumerate}
Circle your choice:\\
Equation (a) goes with Figure 3? Yes, No\\
Equation (b) goes with Figure 3? Yes, No\\
Equation (a) goes with Figure 4? Yes, No\\
Equation (b) goes with Figure 4? Yes, No\\

\newpage
%\item  Matching figures/diagrams with pseudocode
%\begin{enumerate}

\begin{figure}
\centering
\includegraphics[width=0.6\linewidth]{./pic9}
\caption{First}
\label{fig:pic9}
\end{figure}



\begin{figure}
\centering
\includegraphics[width=0.6\linewidth]{./pic10GNU}
\caption{Second}
\label{fig:pic10}
\end{figure}




\begin{multicols}{2}
\begin{algorithm}[H]
\caption{  }
\begin{algorithmic}[1]
\STATE amount = 1;\\
getAmount(n)\{\\
\STATE amount = 0;
\FOR{$i=0$ to $n$}
\STATE \FOR{$j=0$ to $i$}
\STATE amount = amount +j;
\ENDFOR
\ENDFOR\\
return amount;\}
\end{algorithmic}
\end{algorithm}
\columnbreak

\begin{algorithm}[H]
\caption{  }
\begin{algorithmic}[1]
\STATE amount = 1;\\
getAmount(n)\{\\
\IF{$n=0$}
            \STATE return (1)
            
        \ELSE 
            \STATE return(2*getAmount(n-1)+1)
        \ENDIF\\
\} 
\end{algorithmic}

\end{algorithm}

\end{multicols}
\newpage
Circle your choice:\\
Figure 5 goes with Algorithm 3? Yes, No\\
Figure 5 goes with Algorithm 4? Yes, No\\
Figure 6 goes with Algorithm 3? Yes, No\\
Figure 6 goes with Algorithm 4? Yes, No\\


%\item 

%\item  


%\end{enumerate}
%\newpage
%\item  Comprehending figures\\

%Explain why the figure matches the equation $\frac{a+b}{2} \geq \sqrt{ab}$ with equality if and only if $a=b$

%\begin{figure}
%\centering
%\includegraphics[width=0.7\linewidth]{./pic5}
%\caption{}
%\label{fig:pic5}
%\end{figure}

\newpage
%\item  Comprehending symbolic representation\\

Describe in text what this symbolic statement means:\\
\[
\sum_{ k \in \mathbb{N}}^{\infty} (2k+1)
\]
\newpage
%\item  Comprehending pseudocode

Describe in text, what this process is doing:\\
Challenge question: What is the significance of the process described by this pseudocode?

\begin{algorithm}[H]
\caption{  }
\begin{algorithmic}[1]
\STATE done = false;\\
\STATE a = 0;\\
\STATE b = 0;\\
\STATE c=0;\\
\STATE n = 2;\\
\WHILE{!done} 
\STATE{ \WHILE{$a>0$} 
\STATE{ a=a+1;
\WHILE{$b>0$} 
\STATE{ b=b+1;
\WHILE{$c>0$} 
\STATE{ c=c+1;\\
\WHILE{$n>0$} 
\STATE{ n=n+1;\\
\IF{$a^n +b^n = c^n$}
            \STATE done = true;
        \ENDIF\\

} \ENDWHILE
} \ENDWHILE\\
} \ENDWHILE\\
} \ENDWHILE
 
} \ENDWHILE

\end{algorithmic}

\end{algorithm}

\newpage
  Applying symbolic representation to figure

Label these figures mathematical symbols:\\
Challenge question: What is the significance of these figures taken together?

\vspace{1cm}
\begin{figure}[ht]
\centering
\includegraphics[width=0.7\linewidth]{./pic1}
\caption{}
\label{fig:pic1}
\end{figure}


\newpage
 Applying  figure to symbolic representation

Draw a figure that expresses:\\
Through any three points that are not collinear, two can be used to identify a line, and the third can be used, combined with that line, to identify a line parallel to the first line.

\newpage
  Applying pseudocode to figure

Write pseudocode (e.g., as has been seen earlier in these questions) to count the little squares, according to the method suggested by the shading in the figure: \\
Hint: the bottom row could be row 1.\\
$n$ and $k$ could be parameters.%(p. 93)\\

\begin{figure}[ht]
\centering
\includegraphics[width=0.7\linewidth]{./p93}
 
\label{fig:p93}
\end{figure}


\newpage
   Applying pseudocode to symbolic representation

Write pseudocode for the calculation below:\\
Hint: ${ n \choose k} $ means, from a set of size $n$ choose (without replacement) $k$ elements.\\
For example, from a list of friends of size $n$, choose a list of party guests of size $k$. (Without replacement means, you do not send two invitations to the same friend.)

Please say whether the concrete example (friends, guest list) aided your thinking.

${ n \choose k} = {n-1 \choose k-1}+ {n-1 \choose k}$
\newpage
 Synthesis: word problems to figures

Draw a figure for this word problem:\\
Pick an angle between 0 and $\pi/2$ radians, call it $\theta$.\\
A right triangle can be drawn, the height of which is 1 plus the tangent of $\theta$, the base of which is 1 plus the cotangent of $\theta$.  The angle $\theta$ is adjacent to the base. It will be the case that the hypotenuse of this triangle is the cosecant of $\theta$ plus the secant of $\theta$.
\newpage
Synthesis: word problems to symbolic representation\\

Express in symbols this word problem:\\
The number of moves in a game of size n is given by twice the number of moves in a game of size (n-1), plus one more move.
\newpage
 Synthesis: word problems to pseudocode

Write pseudocode for this word problem:\\
Two trains, initially 40 miles apart on the same track, going opposite directions, are getting closer to each other at the rate of 40 miles per hour. An insect flies from one train to the other and back, at a constant speed of $v$, repeatedly. How far does the insect fly, before the trains collide?