Question

Please help me how i do this question

Answer 1

20

Explanation:

There's two elements that you chose in total

You can put 5 numbers (1; 2; 3; 4; 5) in the first place and 4 letters (A, B, C, D) in the second place.

So, now using the combinatorial multiplication rule, we can find the total number of possible outcomes:

5 × 4 = 20

We do not divide by the factorial because the order of composition is important

The answer is 20