probability

Question

one penny, one nickel, one dime, one quarter. select two coins at random. what is the probability that you have at least 25 cents

Answer 1

Note that 4 things taken 2 at a time is 6.

The combinations are:

 

penny and nickle worth 6 cents

penny and dime worth 11 cents

penny and quarter worth 26 cents

nickle and dime worth 15 cents

nickle and quarter worth 30 cents

dime and quarter worth 35 cents

 

Out of the 6 combinations, 3 are worth over 25 cents so the probability that you will have at least 25 cents is 50%.