The set W represents the elements present in water.

W = {hydrogen, oxygen}

The set C represents the elements present in carbon dioxide gas.

C = {carbon, oxygen}

How many elements are in the set W ∪ C?
Choices:
1
2
3
4

Question

The set W represents the elements present in water.

W = {hydrogen, oxygen}

The set C represents the elements present in carbon dioxide gas.

C = {carbon, oxygen}

How many elements are in the set W ∪ C?
Choices:
		1
		2
		3
		4

anonymous · Answer

3

turingtest · Answer

really, how?
could you explain?

turingtest · Answer

I think it might be 4, cuz ther's 2 elemts in each set, ya know?

anonymous · Answer

Im trying to tutor my daughter so can you go into detail with this question ?

anonymous · Answer

∪ = or 
W ∪ C means elements exists in one of the sets can be taken into account.
So, hydrogen, oxygen,carbon, oxygen are all elements but oxygen appears twice. So, there are only 3 elements

anonymous · Answer

|dw:1333211300473:dw|   H=hidrogen   C= Carbon  and O=Oxygen    now U it means all of them... and there are only 3 elements ! @tur