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ASMaths: Pure 1CIERevision Notes4. Sequences & Series4.3 Geometric Progressions4.3.1 Geometric Sequences

Geometric Sequences (CIE AS Maths: Pure 1)

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Geometric Sequences

What do I need to know about geometric progressions?

  • In a geometric progression (also called geometric sequence) there is a common ratio between consecutive terms in the sequence

Geom Seq Illustr, A Level & AS Level Pure Maths Revision Notes

  • You need to know the nth term formula for a geometric progression
u subscript n equals a   r to the power of n minus 1 end exponent
    • a is the first term
    • r is the common ratio

Examiner Tip

  • The formula is given in the formula booklet
  • If you know two terms in a geometric sequence you can find a and r using simultaneous equations. 

Geom Seq Simult, A Level & AS Level Pure Maths Revision Notes

Worked example

Geom Seq Example, A Level & AS Level Pure Maths Revision Notes

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    Roger

    Author: Roger

    Expertise: Maths

    Roger's teaching experience stretches all the way back to 1992, and in that time he has taught students at all levels between Year 7 and university undergraduate. Having conducted and published postgraduate research into the mathematical theory behind quantum computing, he is more than confident in dealing with mathematics at any level the exam boards might throw at you.