Mathematics

Problem

Let

A,\,B

and

C

be three independent events with probabilities

p,\,q

and

r

respectively. Which of the following equals the probability that at least one of the three events occurs? a)

p+q+r

p+q+r-pq-qr-rp

1-(1-p)(1-q)(1-r)

pq+qr+rp