pokemonlv10
New Member
- Joined
- Aug 22, 2016
- Messages
- 9
- Gender
- Male
- HSC
- 2017
Hey guys, need help trying to solve this perms and combs question where:
A total of 5 marbles is selected at random from 4 differently coloured jars. Ear jar contains ten marbles, each being the same colour as the jar it is in and numbered from 1 to 10.
i) What is the probability that of the 5 marbles selected, three are numbered '4' and two are numbered '7'?
ii) Find the probability that the five selected marbles contain at least 4 marbles from the same jar.
Answer:1/27417
ii) 28/703
A total of 5 marbles is selected at random from 4 differently coloured jars. Ear jar contains ten marbles, each being the same colour as the jar it is in and numbered from 1 to 10.
i) What is the probability that of the 5 marbles selected, three are numbered '4' and two are numbered '7'?
ii) Find the probability that the five selected marbles contain at least 4 marbles from the same jar.
Answer:1/27417
ii) 28/703