Permutations & Combinations

What is the formula for Permutations?

• n!
• ^n!∕_(n-r)!
• ^n!∕_(n-r)! r!
• ^r!∕_{(r-n)! n!}

What is the formula for Combinations?

• ^n!∕_(n-r)! r!
• ^n!∕_(n-r)!
• ^r!∕_{(r-n)! n!}
• n!

If all items chosen are treated the same it is a ....

• Comparision
• Permutation
• Combination
• Position

If all items chosen are treated differently it is a ...  

• Comparision
• Permutation
• Combination
• Position

You flip a coin three times. What is the probability of three consecutive heads?

• ½
• ⅓
• ⅙
• ⅛

You have 15 milk chocolate Valentines and 10 dark chocolate Valentines.  What is the probability that the first Valentine handed out is milk chocolate and the second is dark chocolate.

• ¼
• ½
• ⅖
• ⅜

How many ways can you arrange 10 books on a shelf?

• 10

• 100

• 50

• 3,628,800

How many different arrangements can be made from WATER?

• 5

• 120

• 10

• 0

How many different arrangements can be made from MATH?

• 10

• 0

• 6

• 24

How many ways could you choose 2 different letters from SCHOOL?

• 15

• 120

• 10

• 360