Probability Review

Which of the following situations or activities involve permutation?

• Assigning a 4-digit lock in your cellphone number

• Choosing three names from a box

• Electing a president, a vice president and a secretary

• Picking three students to represent the section for Math Quiz Bee

Which of the following is the correct representation of permutation?

• _rP_n

• P (n,r)

• P (r,n)

• None of These

0! is equal to

• 0

• 1

• undefined

• -1

In a school club, there are 8 possible choices for the president, a secretary, a treasurer, and an auditor. Assuming that each of them is qualified for any of these position, in how many ways can the 4 officers be elected? 

• 1600

• 1,680

• 1700

• 1780

In how many ways can a first place, second plance and a third place be chosen from 12 runners?

• 880

• 1320

• 3420

• 4160

Which of these is the formula used in solving a permutation situation?

Where did Roberto made a mistake in his solution?

• 1st Step

• 2nd Step

• 3rd Step

• None of These

Find the number of words, with or without meaning, that can be formed with the letters of word “CHAIR”?

(letters cannot be repeated)

• 120

• 3125

• 5

• 25

Mariam wants to order a sandwich with two of the following ingredients: mushroom, eggplant, tomato, and avocado. How many different sandwiches can Mariam choose?

• 8

• 6

• 4

• 2

What is the formula for combination?