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How many ordered arrangements can be made by taking (3) letters from (A,B,C,D)?

Answer and explanation

Correct answer: (24)

The letters A, B, C, and D are four distinct choices. We need arrangements of 3 letters, and order matters: ABC and BAC are different arrangements. For the first position there are 4 choices. After one letter is used, 3 choices remain for the second position, and then 2 choices remain for the third. Therefore the total is \\(4\times3\times2=24\\), or \\({}^{4}P_3=24\\). Option C is correct.

This is a permutation, not a combination, because the question asks for ordered arrangements. Choosing only three letters without arranging them would use combinations and give a different count, but codes or arrangements distinguish position. Repetition is not indicated, and the four listed letters are distinct, so each choice is used at most once.

Related tags

PermutationsClass11Easy

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