Probability

Question

an urn contains 10 white, 18 red, and 8 blue chips. two chips are drawn without replacement. find the probability of:

1.  first chip red, second chip blue
2. a red and a blue chip
3. first chip not red, second chip blue
4. a non-red chip and a blue chip

Answer 1

White chips= 10,red chips=18, blue chips= 8

Total number of chips in an urn= 10+18+8=36

1) P( first chip red, second chip blue) =18/36 * 8/35........{P (red chip)=18/36 then without replacement, second chip is                                                                                                drawn, reduces total =35, blue chip=8,

                                                                                                                   p(second blue chip)=8/35}                                             

                                                      =4/35