#ATTENDANCE QUIZ FOR LECTURE 3 of Dr. Z.'s Math454(02) Rutgers University

# Please Edit this .txt page with Answers

#Email  ShaloshBEkhad@gmail.com 
#Subject: p3
#with an attachment called
#p3FirstLast.txt
#(e.g. p3DoronZeilberger.txt)

#Right after finishing watching the lecture but no later than Sept. 14, 2020, 8:00pm


Q1. THE FIRST ATTENDANCE QUESTION WAS: WHAT IS A DERANGEMENT?


A1. MY ANSWER TO THE FIRST ATTENDANCE QUESTION IS: 

According to Wikipedia, a derangement is a permutation of the elements of a set, such that no element appears in its original position. It is a 
permutation with no set points. 


Q2. THE  SECOND ATTENDANCE QUESTION WAS: Give two examples of WtoS and StoW.


A2. MY ANSWER TO THE  SECOND ATTENDANCE QUESTION IS:

WtoS Examples:
- WtoS([1,0,1,0,1,0,1]) = {1,3,5,7}
- WtoS([1,1,1,1,1,0,0,0,0,1,0,1]) = {1,2,3,4,5,10,12}

StoW Examples:
- StoW({1,2,3,4,7},10) = [1,1,1,1,0,0,1,0,0,0]
- StoW({1,4,2,8},9) = [1,1,0,1,0,0,0,1,0]