Jeremy needs to choose three flowers for his mother from a group of 10 roses, six of which are red and four of which are white. What is the ratio of the number of ways in which he can select only red roses to the number of ways in which he can select only white roses?	Select
A) 30:1  B) 10:1  C) 5:1  D) 3:2  E) 1:5
you are given 10 roses out of which 6 are red and 4 are white.   Ways of selecting 3 red roses only out of 6 available = 65:13 = 6!/(3!*3!)   Similarly, Ways of selecting 3 white roses only out of 4 available = 45:13 = 4!/(3!*1!)   Thus the ratio = 65:13/45:13 = 5:1   5:1 is the correct answer.
<result>C</result>
Jeremy needs to choose three flowers for his mother from a group of 10 roses, six of which are red and four of which are white. What is the ratio of the number of ways in which he can select only red roses to the number of ways in which he can select only white roses?