We have a small deck of ten cards. Five of the cards are red, three are blue and two are green. We randomly select four cards from the deck with replacement. That is, after we select a card and record the color, we put the card back in the deck and thoroughly shuffle them before we select another card.

1. Let A be the event that the first selected card is the only red card in our four selections. Which of the following events is mutually exclusive from the even A?

A. second card selected is blue.
B. No green cards are selected
C. Third selected card is the only green
D. same number of red and blue cards are selected
E .same number of blue and green cards are selected


2.What is the probability that the first two selected cards are the same color?

You made your account just to ask those dozens of same probability questions ?

maybe, dont worry i will ask macroeconimcs question next week

1 - E since there are 3 selections and only two colours which can be there (namely green and blue), there distribution has to be 2-1 or 3-0

2 - work out the three different probabilities, ie another red, another blue and another green and then add them up

This post was edited by brmv on Apr 16 2013 11:34pm