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Each signal that a certain ship can make is comprised of 3

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Manager
Joined: 10 Oct 2008
Posts: 56
Each signal that a certain ship can make is comprised of 3 [#permalink]

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17 Oct 2008, 09:42
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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?

A. 10
B. 12
C. 20
D. 24
E. 36
Manager
Joined: 14 Jan 2006
Posts: 95
Schools: HKUST

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17 Oct 2008, 10:58
4c3 * 3! = 24
Hence, D
Re: signal   [#permalink] 17 Oct 2008, 10:58
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Each signal that a certain ship can make is comprised of 3

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