Question

If A = {1, 2, 3, 4, 5, 6, 7, 8, 9} and B = {3, 6, 9, 12, 15, 18}, what is A B?
a.{3, 6, 9}
b.{1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 15, 18}
c.{1, 2, 3, 3, 4, 5, 6, 6, 7, 8, 9, 9, 12, 15, 18}
d.{ }

Answer 1

A what B ?

Answer 2

a U b

Answer 3

@hartnn

Answer 4

u know what U stands for ?

Answer 5

no! ):

Answer 6

U stands for Union of elements of the sets

Answer 7

to find the union, u look for all the elements of both the sets, excluding the common ones.

Answer 8

now can u find the union ?

Answer 9

i have no clue how to do this! @hartnn

Answer 10

which numbers are there in set A , write them, then write the numbers in set B
then just remove the common numbers so that they appear only once

Answer 11

would it be d ? @hartnn

Answer 12

@jazy can you help me please ?

Answer 13

As hartnn said, a Union is all the numbers from both set A and set B.

Your choice, d, doesn't have ANY numbers. Try again?