## How do you explain a combination?

Permutations are for lists (where order matters) and combinations are for groups (where order doesn’t matter). In other words: A permutation is an ordered combination. Note: A “ combination ” lock should really be called a “permutation” lock because the order that you put the numbers in matters.

## What is permutation and combination?

Permutations and combinations, the various ways in which objects from a set may be selected, generally without replacement, to form subsets. This selection of subsets is called a permutation when the order of selection is a factor, a combination when order is not a factor.

## How do you find combinations in math?

To calculate combinations, we will use the formula nCr = n! / r! * (n – r)!, where n represents the total number of items, and r represents the number of items being chosen at a time. To calculate a combination, you will need to calculate a factorial.

## How do you calculate number of 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. In our example, we have 52 cards; therefore, n = 52.

## What is the importance of 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.

## How many ways can you arrange 3 things?

Therefore, the number of ways in which the 3 letters can be arranged, taken all a time, is 3! = 3*2*1 = 6 ways.

## What is nPr formula?

Permutation: nPr represents the probability of selecting an ordered set of ‘r’ objects from a group of ‘n’ number of objects. The order of objects matters in case of permutation. The formula to find nPr is given by: nPr = n!/(n-r)! Where n is the total number of objects and r is the number of selected objects.

## What is another name for combination?

What is another word for combination?

amalgamation blend
mix mixture
amalgam compound
composite fusion
meld alloy

## How do you calculate permutations?

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! (n−r)!

## How many combinations of 7 numbers are there?

The number of combinations that are possible with 7 numbers is 127.

## How many combinations of 5 items are there?

People can request 1, 2, 3, 4 or 5 items. According to Pascal’s Triangle (http://mathforum.org/dr.cgi/pascal.cgi) there are 32 different possibilities.

## What is the formula for combinations and permutations?

The formula for permutations and combinations are related as: nCr = nPr/r!

## 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. 