Question

Two judges must be selected from a group of four judges available to serve at a murder trial
Assume that the two judges are to serve two different roles at the trial how many selections of two judges can be made

Answer 1

Answer:

*Based on their experience and their position to handle such matter the judges must be selected

Answer 2

Given, there are four judges out of which 2 must be selected.

the two selected judges are to serve two different roles.

One role can be performed by any of the four judges, so there are four ways to select a judge for the first role.

For the second role there are three judges left.

Using permutation we can say that total number of selections = 4×3 = 12