Answer:
b hopefully this helps you with work
Answer: 3
Step-by-step explanation:
Let E be the event of that student pierces ear and N be the event of that student pierces nose.
Given: 

For any two event A and B, we have

Similarly , 

Hence, 3 students have piercings both on their ears and their noses.
Last one 1/4x
because the opposite of 1/4 is 4/1
Can I please have brainiest also I promise u the answer will be true I had the same question in my Flvs and true was right and false was wrong. I hope u get a hundred on all of the other questions.
X=67
___
20
??? Is that what you needed idk lol