Question

If C = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} and D = {numbers divisible by 3 from 1 to 21}, what is C ∩ D?

{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 18, 21}

{3, 6, 9, 12, 15, 18, 21}

{3, 6, 9}

{ }

Answer 1

hint: the numbers divisible by 3 from 1 to 21 are 3, 6, 9 , 12, 15, 18, 21

does that help?

Answer 2

the second option?

Answer 3

do you remember what \(\cap\) means?

Answer 4

not really,

Answer 5

it means you write the numbers common in C and D

Answer 6

the numbers that BOTH C and D have

Answer 7

so iam right :)

Answer 8

the second option is {3,6,9, 12, 15, 18, 21}

C doesnt have some of those numbers

Answer 9

oh yeah so it has to be [3,6,9]?

Answer 10

yes

Answer 11

sorry for the late reply. i was reading somethign

Answer 12

its okay thanks