Permutations & Combinations

Front

What does 10P5 mean?

Back

Permutations with 10 choices and 5 positions.

Front

Find the number of words, with or without meaning, that can be formed with the letters of the word ‘CHAIR’.

Back

120.

Front

How many ways can a club select a president, vice president, and a secretary from a group of 5 people?

Back

60.

Front

What is the value of 7!?

Back

5040.

Front

What does 20P2 represent?

Back

Permutations with 20 choices and 2 positions.

Front

Define permutations.

Back

Arrangements of objects in a specific order.

Front

Define combinations.

Back

Selections of objects without regard to the order.

Front

What is the formula for permutations of n objects taken r at a time?

Back

nPr = n! / (n - r)!.

Front

What is the formula for combinations of n objects taken r at a time?

Back

nCr = n! / [r!(n - r)!].

Front

Calculate 5P3.

Back

60.