Bunuel wrote:
A jar contains 20 marbles: 4 red, 6 white and 10 blue. If you remove marbles one at a time, randomly, what is the minimum number that must be removed to be certain that you have at least 2 marbles of each colour?
A. 6
B. 10
C. 12
D. 16
E. 18
We have 10 Blue, 6 White, and 4 Red marbles.
We have to certainly remove a minimum of 2 numbers of marbles of each color.
I will go by options:-
A. Remove 6: Chances are there, you may choose 6 whites. --->No Red ,No Blue.......... DISCARD
B. Remove 10: Chances are there, you may choose 10 blue.--->No Red ,No White.......... DISCARD
C. Remove 12: Chances are there, you may choose 10 blue & 2 White.--->No Red.......... DISCARD
D. Remove 16: Chances are there, you may choose 10 blue & 6 White.--->No Red.......... DISCARD
E. Remove 18: Chances are there, you may choose 10 blue(fully taken), 6 White(fully taken), and 2 Red(its automatic).--->Each marbles at a minimum of 2 numbers.......... (This is the answer)
Ans. (E)
_________________
Regards,
PKN
Rise above the storm, you will find the sunshine