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. { }

Answer 1

\(\cap\) means the elements must be in both sets

Answer 2

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

Answer 3

so its like a subset of the first set?

Answer 4

yep, actually it's a subset of both

Answer 5

in this case