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How many arrangements are formed from the letters of the word SUN?

Answer and explanation

Correct answer: 6

The word SUN contains three distinct letters: S, U, and N. When all distinct letters are arranged in a row, the number of arrangements is the factorial of the number of letters. There are 3 choices for the first position, 2 for the second, and 1 for the last, so the total is 3×2×1=3!=6. The six arrangements are SUN, SNU, USN, UNS, NSU, and NUS. Therefore option B is correct. Repeated-letter adjustment is unnecessary because no letter occurs more than once. Option C counts only the letters, while 9 and 18 do not arise from the required factorial calculation.

Related tags

PermutationsWord ArrangementsFactorialPermutations And CombinationsMathematicsClass 11 Mcq

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