It would be the second one
Answer:

Step-by-step explanation:
Let total number of students
Students went to the book fair:
Students went to book fair
Students who bought book:

Hence
of total students bought at least one book.
Answer:
8 5/8
Step-by-step explanation:
hope this helps!
:)
Answer:
1/729
Step-by-step explanation:
Assuming that the probabilities of each digit in the pin is independent from the other digits, the answer to this question can be calculated. There are total of 9 digits, out of which 1 digit is correct. This is true for all the three digits. So the probability of choosing the correct digit in the first place in the first try will be 1/9. Since this is true for the rest of the digits as well and they are independent, we can safely multiply the probabilities. So P(Correct Guess in the first try) = 1/9 (first place) * 1/9 (second place) * 1/9 (third place) =
= 1/729. So the correct answer is 1/729!!!
Answer: 180 degrees
Step-by-step explanation:
The measure of the arc of a semicircle is 180 degrees.