Question

Count the possible combinations of 2 letters chosen from L, M, N, O. The possible combinations of 2 letters are __.

Answer 1

6

Explanation:

The method you were doing was for permutation (nPr) and the question needs you to do the method for combinations (nCr).

Answer 2

The possible combinations of two letters is 12

Explanation:

Here, we want to count the possible combinations of two letters

Now, for the first letter any point in time, we have 4 letters to pick from,

For the second letter we have 3 letters to pick from

So therefore, we have the possible combinations as;

4 * 3 = 12