A bag contains only red, green, brown and yellow marbles.

The probabilities of selecting each colour are shown below.

Colour Red Green Brown Yellow
Probability
x
2
x
3
x
4
x
Find the probability of selecting a green marble.

you want to [post this again, so it makes sense?

To find the probability of selecting a green marble, we need to determine the value of "x". The probabilities given indicate that the ratio of the probabilities of selecting a red, green, brown, and yellow marble is 2:3:4:x.

To find the value of "x", we need to calculate the sum of the probabilities of selecting a red, green, brown, and yellow marble.

So, the sum of the probabilities is:

2 + 3 + 4 + x = 9 + x

Since the sum of the probabilities must equal 1 (since we are selecting one marble), we can set up the equation:

9 + x = 1

Now, we can solve for "x" by subtracting 9 from both sides:

x = 1 - 9
x = -8

However, probabilities cannot be negative numbers. So, it doesn't make sense in this context.

Therefore, there is no valid value of "x" that satisfies the given probabilities. It seems that there might be an error in the given information.