CAIE S1 2022 November — Question 7

Exam BoardCAIE
ModuleS1 (Statistics 1)
Year2022
SessionNovember
TopicPermutations & Arrangements
TypeArrangements with adjacency requirements

7
  1. Find the number of different arrangements of the 9 letters in the word ALLIGATOR in which the two As are together and the two Ls are together.
  2. The 9 letters in the word ALLIGATOR are arranged in a random order. Find the probability that the two Ls are together and there are exactly 6 letters between the two As.
  3. Find the number of different selections of 5 letters from the 9 letters in the word ALLIGATOR which contain at least one A and at most one L.
    If you use the following lined page to complete the answer(s) to any question(s), the question number(s) must be clearly shown.