Question

Is 2 an element of the following sets:
a) {2,{2}} b) {{2},{{2}}} c) {{2},{2,{2}}} d) {{{2}}}

Answer 1

I really do not understand how to tell at all.. I think for part a that yes 2 is a part of the set, and there is also a subset containing 2.

Answer 2

yes, 2 is in set A

but 2 is not in set B, C or D

if you said {2} was in set B, then you'd be correct

Answer 3

2 is different from {2}

Answer 4

Thanks Jim.

Answer 5

np

Answer 6

you can think of a set as a bag with something (or nothing) inside it.

Answer 7

and inside your bag you can have other bags (sets)

Answer 8

order does not count in your bag (set)

Answer 9

each pair of braces { } identifies a bag

Answer 10

each pair of braces delineate a set