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3.3.6 Sequences and series (A-level only)

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Question 9

A mining operation extracts gold from a specific site. The mass of gold extracted in the first month is aaa kg, and the mass extracted in each subsequent month is a constant fraction rrr of the mass extracted in the previous month.

Given that:

  • the total mass of gold extracted in the first three months is 747474 kg
  • the total mass of gold that could theoretically be extracted if mining continued indefinitely is 128128128 kg

find, for this operation,

a.

the common ratio, rrr,

[4]
b.

the mass extracted in the first month, aaa.

[2]

3.3.6 Sequences and series (A-level only) Questions

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