A box of nine iPhone 5C cellphones (the iPhone “for the colorful”) contains two yellow cellphones and seven green cellphones.
(a) If two cellphones are randomly selected from the box, without replacement (the first cellphone is not
returned to the box after it is selected), what is the probability that both cellphones selected will be
green?
(b) If two cellphones are randomly selected from the box, without replacement (the first cellphone is not
returned to the box after it is selected), what is the probability that there will be one yellow cellphone
and one green cellphone selected?
(c) If three cellphones are selected, with replacement (the first cellphones are returned to the box after
it is selected), what is the probability that all three will be yellow?
(d) If you were sampling with replacement (the first cellphone is returned to the box after it is selected),
what would be the answers to (a) and (b)?