2.1- subsets, venn diagrams

roster notation= {#,#,#}

{Distinct letters in the word television}

{t,e,l,v,i,s,o,n}

W= whole number= 0,1,2,3,4,…… etc

“all counting numbers between 3 and 13”

{4,5,6,7,8,9,10,11,12}

{n I 3<n<13, n a counting number}

all possible subsets of “I={5,6}“

0, {5},{6}, {5,6}

how many subsets does the set “L={6,7,8,9}“ have?\

16 [because 2^4]