Answer:
it is number 3 (-1/5)
Step-by-step explanation:
Answer:
x = 25√2, y = 25
Step-by-step explanation:
x = 25(√2) = 25√2
y = 25
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.