## What is the formula to find the possible combinations?

Remember, the formula to calculate 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. Let’s look at an example of how to calculate a combination. There are ten new movies out to rent this week on DVD.

## How many combinations of letters are possible?

The number of possible combinations that are possible with 26 letters, with no repetition, is 67,108,863.

**How many 5 letter combinations are there?**

The different arrangements of five letters that can be made from 26 letters of the alphabet are 7,893,600 ways.

**How many possible combinations of 3 letters are there?**

26⋅26⋅26=263=17576. If you want the letters to be unique, the calculation changes slightly.

### How many combinations of n items are there?

The number of combinations of n distinct objects, taken r at a time is: Cr = n! / r! (n – r)! Thus, 27,405 different groupings of 4 players are possible.

### How many 4 letter combinations can be made from the alphabet?

There are 4! words made from the exact set of 4 distinct letters, so we must divide the total by 4! to get the single word that is in alphabetical order. Thus: (26×25×24×23)/4! total = 14950.

**How many ways can you arrange 26 letters?**

67,108,863 ways

26 letters can be arranged in 67,108,863 ways without any repetition of letters.

**How many ways can 4 letters be arranged?**

The answer is 4! = 24. The first space can be filled by any one of the four letters.

#### How many possible combinations of 3 alphanumeric characters are there?

1 Answer. 7770 triples of distinct alphanumeric characters.

#### What is the combination if’n 10 and r 3?

Plugging in our numbers of n = 10 and r = 3, we get 10 – 3)!

**What is nC2 in combination?**

nC2 is actually the number of combinations of 2 objects given n objects. N can be any integer greater than or equal to 2.

**What is n in combination formula?**

The combinations formula is: nCr = n! / ((n – r)! r!) n = the number of items.

## How many ways can ABCD be arranged?

24

Total possible arrangement of letters a b c d is 24.

## How many different ways can 4 letters be arranged?

**How many ways can you arrange 26 letters into 3?**

**How many permutations of the 26 letters of the English alphabet do not contain the string make and sit?**

The answer is 100 – 32 = 68. How many permutations of the 26 letters of the English alphabet do not contain any of the strings fish, rat, or bird? See Venn diagram. Start with the universe: 26!