## jollysailorbold 2 years ago If set D is a subset of set E, then which of the following is true? -D ∩ E = D -D ∩ E = E -D ∩ E = Ø would it be the first one D ∩ E = D?

1. ReallyPrettyBoyPlaybo

B

2. jollysailorbold

could you explain it? (my lesson didn't explain it well)

3. ReallyPrettyBoyPlaybo

4. ReallyPrettyBoyPlaybo

one sec

5. jollysailorbold

i would've googled it anyways, but there are no good explanations.

6. hartnn

do you know what a subset is ?

7. jollysailorbold

slightly.

8. ReallyPrettyBoyPlaybo

wait its A!!!! JUST GOOGLE IT RIGHT NOW LOL

9. ReallyPrettyBoyPlaybo

woohoOO :D

10. jollysailorbold

reallyprettyboy, i don't think you understand. i want and explanation. :|

11. ReallyPrettyBoyPlaybo

oh ok i'll find one dont worry :)

12. hartnn

if A is the subset of B, then all elements of A are present in B ex : A={1,2} B={1,2,3,4} notice all elements of A are in B ok ?

13. chihiroasleaf

|dw:1358421673278:dw|

14. jollysailorbold

ah, okay.

15. hartnn

so, if now you have to find the intersection (common elements) the it would be entire set A, right ?

16. hartnn

similarly, since D is a subset, intersection is set D itself.

17. jollysailorbold

oh okay:) so it is D ∩ E = D.

18. chihiroasleaf

yup.... :)

19. hartnn

yes! :)

20. jollysailorbold

yay, thank you two:)

21. hartnn

welcome ^_^

22. chihiroasleaf

you're very welcome... :D