Question

Suppose we want to choose 5 letters, without replacement, from 13 distinct letters. How many ways...

Suppose we want to choose 5 letters, without replacement, from 13 distinct letters.

How many ways can this be done, if the order of the choices does not matter?

How many ways can this be done, if the order of the choices matters?

Math   Statistics-And-Probability   
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Answer #1

When the order of choices for the number of formations does not matter, we use the combination technique whereas when the order of choices does matter, we use the permutation technique.

Here

n = 13

r = 5

The number of ways that can be done, if the order of the choices does not matter

=

ways

The number of ways that can be done, if the order of the choices does  matter

=

ways

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