jollysailorbold
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?



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

ReallyPrettyBoyPlaybo
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just google it the answer is most likely B


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

hartnn
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do you know what a subset is ?

jollysailorbold
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slightly.

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


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

ReallyPrettyBoyPlaybo
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oh ok i'll find one dont worry :)

hartnn
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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 ?

chihiroasleaf
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dw:1358421673278:dw

jollysailorbold
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ah, okay.

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

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

jollysailorbold
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oh okay:) so it is D ∩ E = D.

chihiroasleaf
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yup.... :)

hartnn
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yes! :)

jollysailorbold
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yay, thank you two:)

hartnn
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welcome ^_^

chihiroasleaf
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you're very welcome... :D