Question

Rani has a bag with three blue and three yellow coins. She takes out a coin, sees its colour and puts it back in the bag. She does this thrice. What is the probability that she saw all blue coins.

Answer 1

Hello there,

The probability is .125.  The probability  of the blue ball is .5 and recurring is .5. we multiply all three probability is .5 x .5 x .5.

I hope this answers your question

Answer 2

Total probability = 3 blue coins + 3 yellow coins

                            = 6 coins

Now she picks a blue  coin then probability is 3/6 and then puts it back.

           p(event=sees all blue coins) = 3/6*3/6*3/6

                                                          = 1/8 is the answer