O-LevelAdditional MathematicsPermutations and combinationsMay/June 2015Paper 1 Q510 Marks
(a) A security code is to be chosen using 6 of the following: • the letters A, B and C • the numbers 2, 3 and 5 • the symbols * and $. None of the above may be used more than once. Find the number of different security codes that may be chosen if
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The correct answer is —. This question tests the candidate's understanding of permutations and combinations within the Additional Mathematicssyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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