Question

@loser66

Answer 1

The number of subsets that can be created from the set {1, 2, 3} is: 3

Answer 2

how can you get it?

Answer 3

well I mulitply
{1,2,3}
{1}{1,2,3}
{2}{1,3}
{3}{1,2}
So three made sense the most /:

Answer 4

I mean i didn't multiply

Answer 5

ok, I show you how
1) 1 member set: {1}, {2},{3} , so you have 3 subsets for this type, right?

Answer 6

Ye

Answer 7

2) now, 2 member set: {1,2}, {1,3}, {2,3} , you have 3 more, right?

Answer 8

ofc

Answer 9

3) now, 3 member set {1,2,3}
so total you have 7 subsets, right?

Answer 10

yes, seven

Answer 11

However, by definition of subset, you always have empty set is a subset of ANY set

Answer 12

then total is 8 subsets.

Answer 13

I give you the way to calculate the number of the subset of any set, ok?

Answer 14

Oh wow

Answer 15

tell me, how many member are there in this set? {a,b,c,d}

Answer 16

just count them,
ok, I ask other way: how many letter are there in that set?

Answer 17

*I'll

4 letters, i cna mulitply them by 2..each

Answer 18

Yes, for 4, but no for the leftover

Answer 19

4 members, then number of subsets is 2^4 =16

Answer 20

yea i got 16 also

Answer 21

but the way you multiple each by 2 is not the correct one.

Answer 22

like this {1,2,5,8,9,3,15}
how many subsets?

Answer 23

7

Answer 24

7 members, 2^7 = 128 subsets.

Answer 25

x.x

Answer 26

got it?

Answer 27

Yes, that opened my eyes.

Answer 28

ok, last one: {x,c,d,r,t,}
how many subsets?

Answer 29

2^7=14

Answer 30

hey!! how many letter are there?

Answer 31

O.m.g LOL I mean 7

Answer 32

{x,c,d,r,t} how many?

Answer 33

i was looking at the wrong one

Answer 34

O.m.g my bad i mean 5

Answer 35

Do another one

Answer 36

yes, then how many subsets?

Answer 37

2^5=10

Answer 38

oh, no 2^5 =32
\(2^5 = 2*2*2*2*2=32\)
\(2^5 \neq 2*5\)

Answer 39

Yeah, I multiplied it wrong way.