A box contains five balls of same size and shape. Three of them are green coloured balls and two of them are orange coloured balls. Balls are drawn from the box one at a time. If a green ball is drawn, it is not replaced. If an orange ball is drawn, it is replaced with another orange ball.
First ball is drawn. What is the probability of getting an orange ball in the next draw?
Answer : Option D.
We can solve it using tree diagram.
Tree Diagram is the best method to solve many Probability Questions.
ya but GATE committe can give both option as correct as in other branches they do. even after challeging this question they ignored. more importantly i think this question was made for a trap because why would they given ½ as option means they tried question with both method and given option they are clear and assume that ‘replaced with’ is same as ‘replaced by’ so we can’t argue they might researched.
i know this question created a lot of ambiguity but i suggest all of you to go to this link and see that EXTRA BALLS ARE ADDED..
I believe this is similar question. Here extra ball is added
@Deepakk Poonia (Dee) sir , what do you think , is it worth challenging if GATE doesnt give ½ as ANS ?
hi, we all should challenge this question together. If only few person challenges it then the gate committee would ignore the challenge. But if several people challenge it then they would consider it. I created a temporary discord server for discussing on challenging this question, please join https://discord.gg/wkdWj5J3Ja . 2 marks is a lot, don’t let it go.
@rsonx bro did you challenged?