Question

Write down all subsets of {1,2,3}.

Answer 1

i would start by listing them based on size

Answer 2

{}
{1}, {2}, {3}

Answer 3

can you try listing out the subsets of size 2 ?

Answer 4

is {} the empty set?

Answer 5

{1,2},{2,3}

Answer 6

So...
{},{1},{2},{3},{1,2}{2,3}{1,2,3} ?

Answer 7

{} has nothing in it so yeah its an empt set, you could also represent it using the symbol \(\large \emptyset\)

Answer 8

looks you're missing one subset

Answer 9

you should get 2^3 = 8 different subsets

Answer 10

{1,3} ?

Answer 11

Thanks Ganeshie8!

Answer 12

yes :)

Answer 13

This is an useful formula to memorize :

number of subsets of a set with "n" elements is 2^n