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iGCSE (2021 Edition)

9.05 Geometric series

Interactive practice questions

Find the sum of the first $5$5 terms of the geometric sequence defined by $a=2.187$a=2.187 and $r=1.134$r=1.134.

Give your answer correct to two decimal places.

Easy
2min

Find the sum of the first $5$5 terms of the geometric sequence defined by $a=-4.186$a=4.186 and $r=-2.848$r=2.848.

Give your answer correct to two decimal places.

Easy
2min

Consider the series $5+\frac{5}{2}+\frac{5}{4}$5+52+54 ...

Easy
2min

Consider the series $4+12+36$4+12+36 ...

Find the sum of the first $12$12 terms.

Easy
1min
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Outcomes

0606C12.3B

Recognise geometric progressions.

0606C12.4B

Use the formulae for the nth term and for the sum of the first n terms to solve problems involving geometric progressions.

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