31. 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

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(b)12

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(d)24

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Solution

The correct option is D (d)24
Ans: (d)
Its ⁴C₃ * ³P₃ = 24.

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