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Multiple choice

In how many distinct ways can one arrange the letters a, a, b, b in a row?

  1. 4

  2. 5

  3. 6

  4. 3

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total permutations of 4 items = 4! = 24. Since there are 2 identical 'a's and 2 identical 'b's, we divide by 2! for each: 24/(2! × 2!) = 24/4 = 6 distinct arrangements.

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