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General Mathematics Paper 2,Nov/Dec. 2007  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 Main
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question 5

Let U   = {x : x is an integer from 1 to 20},
      A =  {multiples of 5 },
      B =  {multiple  of 3 } and
      C =  { factors of 20 }

If x is chosen at random from U   , find the probability that :

  • x € A n B;
  • x € A υ B;
  • x € A n B n C
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OBSERVATION

This question was very popular among the candidates and many gave a good account of themselves.  However, many candidates failed to enclose the elements in the curly brackets.  Some did not separate the elements with commas while others omitted 1 and 20 in set C as factors of 20.
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