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In the word (RADAR), (R) occurs twice and (A) occurs twice. How many distinct arrangements are possible?

Answer and explanation

Correct answer: 30

RADAR has 5 letters, with 2 identical R's and 2 identical A's. Therefore, the number of distinct arrangements is \(\frac{5!}{2!\,2!}=\frac{120}{4}=30\). The value 120 would apply if all five letters were different; swapping identical letters does not create a new arrangement. Exam tip: for repeated objects, divide the total factorial by the factorial of each repeated group.

Related tags

PermutationsRepeated LettersDistinct ArrangementsClass 11 MathematicsFactorialsPermutations And CombinationsMathematicsClass 11 Mcq

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