A bag contains 5 red marbles and 3 yellow marbles. What is the probability of drawing a red marble, then replacing that marble, then drawing a red marble again on the second pick?
A. 9/64
B. 15/64
C. 25/64
D. 5/8

Question

A bag contains 5 red marbles and 3 yellow marbles. What is the probability of drawing a red marble, then replacing that marble, then drawing a red marble again on the second pick?
A. 9/64  
 B. 15/64  
 C. 25/64  
 D. 5/8

radar · Answer

This is like the problem where it was turned around (3 red and 5 different color)  I did that one for you also.  In this one the probability of the first drAW is 5/8, Since you replaced the marble, your probability on the second draw is also 5/8.  Your probability of doing it TWICE is 5/8 x 5/8 or 25/64     choice C