Question

The probability he chooses get marbel

Answer 1

Step 1: Problem

Step 2: Concept

`\text{Probability of any event = }\frac{n\text{ umber of required outcome}}{n\text{ umber of total possible outcome}}`

Step 3: Method

Red R = 3

Blue B = 2

Green G = 5

Total = 10

Apply tree diagram

Probability of choosing a red marble without replacement then a blue marble = Red, and Blue

'AND' in probability mean multiplication.

`\begin{gathered} =\text{ }\frac{3}{10\text{ }}\text{ x }(2)/(9) \\ =\text{ }(6)/(90) \\ =\text{ }(1)/(15) \end{gathered}`

Step 4: Final answer

Probability of choosing a red marble without replacement then a blue marble = 1/15