39/89 because of sohcahtoa
The next two term in patterns is below
3,6,5,10,9,18,17,34,33,66
The way you work this out is by thinking about the odds of each singular event, then finding the overall odds based on the individual odds.
The number of different books Mrs. Reid can choose is 9, so the first number is 9.
Mrs. Reid has picked one book so far, so now she has (1 - 9) = 8 books to choose from.
The of different books Mrs. Reid can choose now is 8, so your second number is 8.
Mrs. Reid has picked 2 book thus far, so now there are (2 - 9) = 7 books to choose from.
The of different books Mrs. Reid can choose now is 7, so your second number is
7.
To get the total number of different choices, multiply all the singular events together:
Answer:

Step-by-step explanation:
pull like terms from the problem to re-arrange it into a product

Oh how I miss the days when math was as simple as 2+2=4.
Educated guess here: By putting parentheses.