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Is chooses a verb?
Choose is a verb. It means to make a choice between two or more things.
If there are 5 different pizza toppings and you choose 2 how many combinations will you have?
10
How many different kinds of pizzas can you make out of 5 toppings?
If you must use all 5 with no repetition, you can make only one pizza. 5C5, the last entry on the 5 row of Pascal's triangle. If you can choose as many toppings as you want, all the way down to none (cheese pizza), then you have 5C0 + 5C1 + 5C2 + 5C3 + 5C4 + 5C5 = 32. Another way to think about it is no toppings would allow one pizza (cheese), one topping would allow two pizzas (cheese, pepperoni), two toppings would allow four pizzas, three toppings would allow eight pizzas, four toppings would allow sixteen, creating an exponential pattern. p = 2 ^ t. So, 10 toppings would permit 1024 different combinations
How many different combinations of 4 books can be chosen from 6 books?
The number of 4 different book combinations you can choose from 6 books is;6C4 =6!/[4!(6-4)!] =15 combinations of 4 different books.
A homeowner chooses 9 of 25 plants at a nursery to landscape her front yard Which expression gives the number of ways she can choose the plants?
If the order of choice does not matter, the expression is 25 X 24 X 23 X 22 X 21 X 20 X 19 X 18 X 17, which can also be written as 25!/16!.
