Problema Solution
a bag contains 16 red marbles, and 10 blue marbles. if two marbles are chosen at random, what is the probablity of getting two red marbles?
Answer provided by our tutors
a. get off and put it back
the probablity of getting two red marbles is 16/(10+16) * 16/(10+16) = 64/169
b. get off but not put it back
the probablity of getting two red marbles is 16/(10+16)*15/(10+15) = 24/65