Question

If four marbles are picked at random what is the probability that two are blue and one is gree and one is red

Answer 1

There are 4 marbles,

As colours are not given , So we can Assume that :

2 balls are Blue ,

1 Ball is Red , and

1 Ball is Green,

Outcome = { Blue , Blue , Red , Green }.

i) So Probability of Outcome of blue ball = 2 { Blue , Blue }

Therefore , Probability =  Chances of Outcome / Number of Outcome

Therefore , Probability = 2 / 4

                                        = 1 /  2.

ii) Probability of Green Ball = 1 { Green }

Therefore , Probability =  Chances of Outcome / Number of Outcome

Therefore , Probability = 1 / 4.

iii) Probability of Red Ball = 1 { Red }

Therefore , Probability =  Chances of Outcome / Number of Outcome

Therefore , Probability = 1 / 4.

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Thanks

Regards

Aditya Suryawanshi