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}

{ }

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}

{ }

lgbasallote · Answer

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

anonymous · Answer

the second option?

lgbasallote · Answer

do you remember what $\cap$ means?

anonymous · Answer

not really,

lgbasallote · Answer

it means you write the numbers common in C and D

lgbasallote · Answer

the numbers that BOTH C and D have

anonymous · Answer

so iam right :)

lgbasallote · Answer

the second option is {3,6,9, 12, 15, 18, 21}

C doesnt have some of those numbers

anonymous · Answer

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

lgbasallote · Answer

yes

lgbasallote · Answer

sorry for the late reply. i was reading somethign

anonymous · Answer

its okay thanks