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?
Choose one answer.
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

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?
Choose one answer.
	 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. { }

anonymous · Answer

$\cap$ means the elements must be in both sets

anonymous · Answer

oh ok ive been trying to figure out what that thing means

anonymous · Answer

so its like a subset of the first set?

anonymous · Answer

yep, actually it's a subset of both

anonymous · Answer

in this case