Câu hỏi Toán học

Ben can take any one of three routes from school (S) to the town center
(T), and can then take five possible routes from the town center to his
home (H). He doesn't retrace his steps.
How many different possible ways can Ben walk home from school?

• 7

• 8

• 15

• 125

Sarah goes to her local pizza parlor and orders a pizza. She can choose either a large or a medium pizza, can choose one of seven different toppings, and can have three different choices of crust.
How many different pizzas could Sarah order?

• 12

• 20

• 27

• 42

Derek must choose a four-digit PIN number. Each digit can be chosen from 0 to 9.
How many different possible PIN numbers can Derek choose?

• 5040

• 6561

• 9000

• 10000

Ravi goes to a pet shop and finds that the pet shop has 3 turtles, 4 birds, 5 rabbits, and 6 fish. If Ravi can only pick one animal as a pet, how many choices does Ravi have for a pet?

• 15

• 18

• 21

• 24

For her literature course, Rachel has to choose one novel to study from a list of four, one poem from a list of six and one short story from a list of five.
How many different choices does Rachel have?

• 15

• 120

• 240

• 225

James has to choose his options in his final year at school. He must choose one subject from each of five different option groups.

In the first group, there are six subjects to choose from.
In the second group, there are four subjects to choose from.
In the third group, there are five subjects to choose from.
In the fourth group, there are two subjects to choose from.
In the fifth group, there are four subjects to choose from.

How many possible choices of subjects can James make?

• 480

• 960

• 1200

• 4800

Jenny has nine different skirts, seven different tops, ten different pairs of shoes, two different necklaces and five different bracelets.

Choosing one of each item, in how many ways can Jenny dress up?

• 6300

• 7500

• 63000

• 75000

Simon visits his local fast-food restaurant and orders a burger, a side, a drink and an ice cream. He can choose either a hamburger, a cheeseburger or an eggburger; he can choose either fries or salad as a side; he can choose one drink from cola, lemonade, orange or raspberry; and for his ice cream he can choose either a cone or a sundae.
How many different possible meals could Simon choose?

• 12

• 24

• 36

• 48

How many even five digit whole numbers are there?

• 15000

• 45000

• 50000

• 100000

Suppose there are 5 chicken dishes and 8 beef dishes. How many selections does a customer have ?

• 40

• 3

• 20

• 13