Probability with Permutations

nPr =

• n! / (n-r)!

• n! / r!(n-r)!

• n(n - 1)(n - 2)...(n - r)

• (nCn) (n/r)

How many ways can a stylist arrange 5 of 8 vases from left to right in a store display?

• 6720

• 672

• 40

How many ways can the letters in the word PARALLEL be arranged?

• 3332

• 336

• 3360

• 3630

Find the number of permutations possible when ordering 6 objects.

• 700

• 890

• 72

• 720

Six friends sit around a campfire. If they randomly sit around the campfire, what is the probability that their ages will be in numerical order?

• 1/120

• 1/20

• 120

• 20

The 5 members of the chess club line up in random order for a muffin and hot drink. What is the probability that the first 2 in line will be ranked in the order best to second best chess players in the club?

• 1/6

• 1/22

• 1/20

• 1/14