# Solutions

Get detailed explanations to advanced GMAT questions.

### Question

Each signal that a certain ship can make is comprised of 3 different flags hanging vertically in a particular order. How many unique signals can be made by using 4 different flags?

Option A:

10

Option B:

12

Option C:

20

Option D:

24

Option E:

36

### Difficulty Level

Medium### Solution

Option D is the correct answer.

### Option Analysis

A signal can be made using 3 flags.

We have total of 4 , so 3 can be chosen out of 4 in 4C3 = 4C1 = 4 ways

The three flags can be arranged in 3 ! ways to make a unique combination.

Hence 4 * 3! = 24 ways.

### Related Questions

- To raise funds, a racing team sold T-shirts imprinted with the team’s logo. The team paid their supplier a…

- If x/y = 2/3 , then (x-y)/x =

- At Company X senior sales representatives visit the home office once every 30 days, and junior sales…

- 6.2 is what percent of 1000?

- If the positive number d is the standard deviation of n, k and p then the standard deviation of n+1, k+…