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4 marksNumber Sequences and Rules

CSEC Mathematics · May/June 2013 · Paper 2 · Question 8(b)(ii)

The table shows the number of wires (W) and balls (B) for diagrams in a sequence (N). For N=1, W=12, B=8. For N=2, W=20, B=12. For N=3, W=28, B=16.

Complete the table by inserting the missing values at the rows marked (ii) for N=20.

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Other parts of this question

  1. 8(a)Draw a sketch of Diagram 4, the fourth diagram in the sequence.[2 marks]
  2. 8(b)(i)Complete the table by inserting the missing values at the rows marked (i) for N=4.[2 marks]
  3. 8(c)(i)Write the rule which may be used to find the value of W where N is known.[1 mark]
  4. 8(c)(ii)Write the rule which may be used to find the value of B where N is known.[1 mark]

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