3. A bag contains 1 red disc, 2 blue discs and 3 green discs.
Xanthe chooses a disc at random from the bag. She notes its colour and replaces it.
Then Xanthe chooses another disc at random from the bag and notes its colour.
(a) Complete the probability tree diagram showing all the probabilities.
First disc
Second disc

try soting them out first

step-by-step explanation:

2 equivalent expressions to represent the area of a rectangle and the top is n-3 and the side is 2

area of the rectangle = length * width

given length = n - 3

width = 2

replace it in the area

so area of the rectangle = (n-3) *2

= 2(n-3)

one of the expression is 2(n-3)

to get another expression we distribute 2 inside the parenthesis

2(n-3) is 2n - 6

so another expression is 2n - 6

two equivalent expression are

2(n - 3)   , 2n - 6