GP ji, I read the question by OP and, I read your response. You just wrote down the generic mutual exclusion principle formula. You did not mention anything "about the issue of $29".

You arrogantly announce  "Learn Venn Diagram" in the first sentence of your response, and then  you don't follow up your answer clearly. And now, you ask me, politely though, to re-read the question again.I read the question. I understand the question. Chill a little buda ba.
Actually, I was a little ticked off by your "learn Venn diagram" comment. Otherwise I wouldn't have included your name.