Question

C = {2, 4, 6, 8, 10, 12, 14, 16} and D = {numbers divisible by 4 from 1 to 20}, what is C ∩ D?

Answer 1

Do you know what does ∩ mean?

Answer 2

no

Answer 3

It means 'intersection' you put all the similar numbers in set C & D like this :

C = {2, 4, 6, 8, 10, 12, 14, 16}
D= {4 8 12 16 20}

What similar numbers do you find between the two sets?

Answer 4

You put it as:

C ∩ D= { }

You put the similar numbers between C & D in the set ^ & you're done :)

Answer 5

let me give you an example, I can see 4 in C & D so I'll put it in the set C ∩ D= { 4, }
what else do you see?

Answer 6

(ok I know... I'm sorry I don't explain very well :( but do you get it somehow? )