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If an ordered arrangement of 2 letters is to be made from A, E, I, O, and U, how many ways are possible?

Answer and explanation

Correct answer: 20

Because the arrangement is ordered, this is a permutation rather than a combination. There are 5 choices for the first position. After one vowel has been used, 4 different vowels remain for the second position, so the total is 5 × 4 = 20. In formula form, ⁵P₂ = 5!/(5−2)! = 5!/3! = 20. Therefore, option D is correct. The value 10 would be ⁵C₂ and would count pairs without considering order; however, AE and EA are different ordered arrangements. The value 25 incorrectly allows the same letter to be used twice, and 5 counts only the first position. Since the question asks for two letters arranged in order and does not allow repetition, 20 is the unambiguous result.

Related tags

PermutationsOrdered LettersWithout RepetitionClass 11Permutations And CombinationsMathematicsClass 11 Mcq

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