Combinations Probability

Permutation, combination, or neither?
Rob and Mary are planning trips to 9 countries this year.  There are 13 countries they would like to visit.  They are deciding which countries to skip.

• combination
• permutation
• neither

Permutation, combination, or neither?
The batting order for seven players on a 12 person team.

• combination
• permutation
• neither

Which of the following is an example of combination?

• Form a passcode with 4 digits
• Students line up in a queue to assembly
• Choose 4 students in a class committee
• Choose the chairperson, secretary and treasurer in a club

Permutation, combination, or neither?
A team of 8 basketball players need to choose a co-captain and captain.

• combination
• permutation
• neither

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

What is the n value for choosing 5 cards from a standard deck of cards? 

• 2
• 5
• 13
• 52

What is the r value for choosing 5 cards from a standard deck of cards? 

• 2
• 5
• 13
• 52