khan academy permutations and combinations

1. How do you calculate permutation combinations?
2. How do you calculate the number of possible combinations?
3. What is the counting rule?
4. How do you know if its permutation or combination?
5. What is nPr formula?
6. What is r in combination formula?
7. What is combination?
8. What is 4c2 combination?
9. What is 3c1 combination?
10. How many combinations of 12 numbers are there?

How do you calculate permutation combinations?

If the order doesn't matter then we have a combination, if the order does matter then we have a permutation. One could say that a permutation is an ordered combination. The number of permutations of n objects taken r at a time is determined by the following formula: P(n,r)=n!

How do you calculate the number of possible combinations?

The formula for combinations is generally n! / (r! (n -- r)!), where n is the total number of possibilities to start and r is the number of selections made.

What is the counting rule?

Fundamental Counting Principle Definition.

The Fundamental Counting Principle (also called the counting rule) is a way to figure out the number of outcomes in a probability problem. Basically, you multiply the events together to get the total number of outcomes.

How do you know if its permutation or combination?

When the order doesn't matter, it is a Combination. When the order does matter it is a Permutation.

What is nPr formula?

In Maths, nPr and nCr are the probability functions that represent permutations and combinations. The formula to find nPr and nCr is: nPr = n!/(n-r)! nCr = n!/[r!

What is r in combination formula?

The formula for combinations is nCr = n! / r! * (n - r)!, where n represents the number of items, and r represents the number of items being chosen at a time.

What is combination?

A combination is a mathematical technique that determines the number of possible arrangements in a collection of items where the order of the selection does not matter. In combinations, you can select the items in any order. Combinations can be confused with permutations.

What is 4c2 combination?

4 CHOOSE 2 = 6 possible combinations. 6 is the total number of all possible combinations for choosing 2 elements at a time from 4 distinct elements without considering the order of elements in statistics & probability surveys or experiments.

What is 3c1 combination?

3 CHOOSE 1 = 3 possible combinations. 3 is the total number of all possible combinations for choosing 1 elements at a time from 3 distinct elements without considering the order of elements in statistics & probability surveys or experiments.

How many combinations of 12 numbers are there?

So 479001600 combinations are possible if repetition is not allowed. If repetition of digits is allowed then, 12^12 combinations are possible.