Combination and Permutations

Question 1

What is the difference between combinations and permutations?

Answer 1

Order doesn’t matter
Order does matter

Question 2

What is the formula for combinations without repetition?

Answer 2

n! / (n - r)!*r!

Question 3

What is the formula for permutations without repetition?

Answer 3

n! / (n - r)!

Question 4

What is the formula for combinations with repetition?

Answer 4

(r + n - 1)! / r!(n - 1)!

Question 5

What is the formula for permutations with repetition?

Answer 5

n^r

Question 6

What do the symbols n and r represent in permutations and combinations?

Answer 6

r = number wanted
n = entire set

Question 7

When does order not matter?

Answer 7

When pairs of objects are not counted as the same