Find B D.
B: {−2, −1, 1, 4, 7, 12}
D: {numbers divisible by 3 from 1 to 15}

{12}
{−2, −1, 1, 3, 4, 7, 12}
{−2, −1, 1, 3, 4, 6, 7, 9, 12, 15}
{ }

Question

Find B  D. 
B: {−2, −1, 1, 4, 7, 12} 
D: {numbers divisible by 3 from 1 to 15}
 	
	{12}
	{−2, −1, 1, 3, 4, 7, 12}
	{−2, −1, 1, 3, 4, 6, 7, 9, 12, 15}
	{ }

anonymous · Answer

Union

anonymous · Answer

Find all the numbers divisible by 3 in set B

anonymous · Answer

only 12

anonymous · Answer

Yep (:

hero · Answer

No, you guys are interpreting incorrectly.

hero · Answer

Union means to put everything in both sets in the same box, then remove repetitions. Don't get union mixed up with intersection.

anonymous · Answer

so explain

hero · Answer

D: {numbers divisible by 3 from 1 to 15} = {3, 6, 9, 12, 15}
    
B U D = {-2, -1, 1, 3, 4, 6, 7, 9, 12, 12, 15} 
         = {-2, -1, 1, 3, 4, 6, 7, 9, 12, 15}

hero · Answer

Basically, you did two previous problems that showed the difference between union and intersection. Try to understand the difference between them.

anonymous · Answer

@Hero Yeah he's right I got mixed up there for a sec, Union means to put everything in both sets together, so all the numbers in set B AND all the numbers from 1 to 15 that are divisible by 3

hero · Answer

...and remove any repetitions.

anonymous · Answer

so C?

hero · Answer

Since 12 repeats twice, remove one of them.

anonymous · Answer

Yeah, remember that too

hero · Answer

That's honestly the best way to do these without messing up.

anonymous · Answer

oh ok thanks