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Of the 35 students in my class, 11 practice taekwondo, 11 play piano, and 20 take math lessons. 4 students play piano and go to math lessons, 3 students do taekwondo and play piano, 5 students go to math lessons and practice taekwondo, and 3 students do none of these. How many students do all 3?

 

Thank you to the people who will answer this!

 Jun 13, 2021
 #1
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By Inclusion-Exclusion, there are 5 people who do all three activities.

 Jun 13, 2021
 #2
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Looks like 2 to me

 

 Jun 13, 2021

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