Multiple choice In how many distinct ways can one arrange the letters a, a, b, b in a row? 4 5 6 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.