O-LevelAdditional MathematicsPermutations and combinationsMay/June 2015Paper 2 Q58 Marks
There are twenty numbered balls in a bag. Two of the balls are numbered 0, six are numbered 1, five are numbered 2 and seven are numbered 3, as shown in the table below. Number on ball (0, 1, 2, 3), Frequency (2, 6, 5, 7). Four of these balls are chosen at random, without replacement. Calculate the number of ways this can be done so that
📋 Examiner Report & Trap Analysis
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...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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