Skip to content

Course home

1.7.5 Geometric sequences and series (A-level only)

1.7.5 Geometric sequences and series (A-level only)

EasyMedium
12345678910111213141516171819202122232425262728293031323334353637
Question 2
52%

The second term of a geometric series is 4 and the sum to infinity is 18.

a.

Find the two possible values of rrr.

[2]
b.

Find the corresponding two possible values of aaa.

[2]
c.

Given that r r\,r takes the smaller of the two possible values, find the smallest value of n n\,n for which Sn>17.9S_n > 17.9Sn​>17.9.

[3]
Markscheme

1.7.5 Geometric sequences and series (A-level only) Questions

  1. A Level
  2. /Maths
  3. /1.7.5 Geometric sequences and series (A-level only)

38 exam-style questions on AQA A Level Maths 1.7.5 Geometric sequences and series (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

Question bank