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Try to draw a venn diagram first

Can you do that Saif ?

|dw:1365077901699:dw|

I have already drawn it. Still unable to do it. :s

No problem. You would do it now.

Only once you help me then i'll be able to do it.

It is given that 12 members are of athletics and drama both .
|dw:1365078073152:dw|

|dw:1365078114787:dw|Now tell me that to do?!

what*

Check that again! I think there is some fault.

Where? In the question?

In the diagram. Drama and athletics = 12 members. and Drama and basket =19 . Have you reversed them?

Nope.

You have marked drama and athletics as 19 members, right?

No idea. :S @Mimi_x3

|dw:1365078569066:dw|

Ohh. I wrote it wrong here. On the paper it's in the right order.

you should start in the middle and work your way outwards

Yes thought the same Saif.

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How? @amistre64

12 students total are in BOTH A and D, we already know 5 of them, whats left? 12 - 5 = ?

Now we will exclude the all three three club members from the common areas .

Yep the one amistre suggested.

we know 13 total are in BOTH, B and A. and we already know of 5 of them, 13 - 5 = ?

Sorry. Don't get it. :/ @amistre64

How we already know 5 of them?

|dw:1365078755446:dw| the boundary I drew has 12 members. Right?

right

|dw:1365078760078:dw|

|dw:1365078840934:dw|

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Now we have the intersection of athletics and drama as : 5 + something = 12 .. getting it?

http://i3.kym-cdn.com/entries/icons/original/000/009/993/tumblr_m0wb2xz9Yh1r08e3p.jpg

I totally get that subtraction thing. Whats next?

Good.

May I interupt with a diagram ?

|dw:1365079086252:dw|

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Nice work @amistre64 and @mathslover . Leave rest of me.
Thanks a lot. (:

I would stop myself now. Amistre, continue.

good luck ;)

You're welcome!

Thank you!