HELPP !

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?

A.1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 18, 21}
B. {3, 6, 9, 12, 15, 18, 21}
C. {3, 6, 9}
D. { }

Question

HELPP !

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?  

A.1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 18, 21}
B. {3, 6, 9, 12, 15, 18, 21}
C. {3, 6, 9}
D. { }

hartnn · Answer

C ∩ D are the elements which are common to C and D.
which are those elements ?
can u form the set D ?

anonymous · Answer

I wouldnt be asking if i could form set D..

hartnn · Answer

which numbers are multiples of 3 till 21 ?

anonymous · Answer

3, 7, & 9

hartnn · Answer

7 is not the multiple of 3 ...

anonymous · Answer

Oh, I didnt read the question right.

hartnn · Answer

the common elements will only contain the multiples of 3 from 1 to 10.
so which numbers are divisible by 3 in 1 to 10 ?

anonymous · Answer

3, 6 & 9

hartnn · Answer

that would be your answer.