Question

There is a bag filled with 4 blue and 5 red marbles. A marble is taken at random from the bag, the colour is noted and then it is replaced. Another marble is taken at random. What is the probability of getting at least 1 blue?

Answer 1

the answer is.........-36/121

Answer 2

Given,

4 Blue marbles

5 Red marbles

To find,

Probability of getting at least one blue marble.

Solution,

We can find the solution for this problem by the following method-

Given that there are 4 blue marbles and 5 red marbles.

So, number of marbles in total            =4 blue marbles+5 red marbles

                                                              = 9 marbles

Possibility of marbles' outcomes         = 9 outcomes

Possibility for red marbles' outcomes =  $\frac{5}{9}$ outcomes

(Because out of 9 marbles, 5 are red marbles)

Probability of getting blue marbles' outcomes= $\frac{4}{9}$ outcomes

(Because out of 9 marbles, 4 are blue marbles)

Probability for getting one blue marble = 4/9

Thus, the probability of getting at least 1 blue marble is 4/9.