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Here is my question

In a class which has $36$ students, there are $26$ students who passed math and $20$ students who passed physics exam and $4$ students couldn't pass the both subjects.

Then, how do we find the students who passed the both exam?

Regards!

Asaf Karagila
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    This is not really related to the group theory. But anyway, you can use inlcusion-exclusion formula: $|A\cup B|=|A|+|B|-|A \cap B|$. – user340297 Oct 28 '17 at 12:28
  • @user340297 Can you show the solution for which you gave? –  Oct 28 '17 at 16:29

1 Answers1

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$36-4=32$ students passed one or the other.

$26+20-32=14$ passed both. See the diagram...

Hope it helps

$$...$$

enter image description here

Raffaele
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