15 counters in the whole set. how many are there in 2/3 of the set?

What is always true about a positive integer raised to a negative odd power?

Ineed here’s a picture of the question

The computer that controls a bank's automatic teller machine crashes a mean of 0.6 times per day. what is the probability that, in any seven-day week, the computer will crash less than 5 times? round your answer to four decimal places