Question

Did I do this correctly?


"Create a set of numbers and call the set N. Describe a subset of N and explain why it is a subset of N."

Answer 1

N:{1, 2, 3 ,4 ,5 , 6 , 7 ... 20}

C:{Numbers divisible by three}

~N{3, 6, 9, 12, 15, 18}

Answer 2

yes, the subset is correct, but why the notation ~N ?

Answer 3

You an use: N' or ~N

Answer 4

wouldn't N' or N~ be the complement of N ?
use another name for subset, say M

Answer 5

I don't understand? "wouldn't N' or N~ be the complement of N ?"

Isn't it a complement?

Answer 6

but your question does not ask for complement, it asks for subset
and complement and subsets are 2 different things

Answer 7

Can you explain the difference, please?

Answer 8

yes,
A = {1,2,3,4,5}
let B be the even numbers in A
so B= {2,4}
here B is a subset of A since all elements of B are in A
now complement of B = B' = B~ = {1,3,5} = elements not in B but are in A = odd elements of A
got this much ?

Answer 9

so for your example :
N:{1, 2, 3 ,4 ,5 , 6 , 7 ... 20}
Let C be subset of N defined by
C:{Numbers divisible by three}

C:{3, 6, 9, 12, 15, 18}

Answer 10

Okay, so ~B means elements in A that are not in B

Subset is elements in B that are in A.

Answer 11

so ~B means elements in A that are not in B , correct .
subset is a set formed from A(universal set) such that elements of subset are all taken from A only

Answer 12

so in your example, in subset c, you are just taking elements of N which are divisible by 3

Answer 13

Roger that.

Answer 14

ask if any more doubts ?

Answer 15

I'm good. I'll be sure to message you in the future if I have any questions or concerns.

Answer 16

good :) or feel free to tag me in your question

Answer 17

Ok.