Permutation and Combination Notation

Front

What is the formula for combinations (nCr)?

Back

nCr = n! / (r! * (n - r)!) where n is the total number of items, and r is the number of items to choose.

Front

What is the formula for permutations (nPr)?

Back

nPr = n! / (n - r)! where n is the total number of items, and r is the number of items to arrange.

Front

Calculate 9C6.

Back

84

Front

What is 7! (7 factorial)?

Back

5040

Front

What is 3 factorial (3!) equal to?

Back

6

Front

Calculate 15P8.

Back

259459200

Front

Calculate 6P5.

Back

720

Front

What does n! (n factorial) represent?

Back

The product of all positive integers up to n.

Front

What is the value of 0! (zero factorial)?

Back

1, by definition.

Front

How many ways can you arrange 5 books on a shelf?

Back

5! = 120 ways.