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CIE A Level Maths: Pure 1復(fù)習(xí)筆記4.3.1 Geometric Sequences

Category: A-level課程, 教材筆記, 福利干貨 Date: 2022年8月19日 上午10:48

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

4.5.1-Geom-Seq-Illustr

  • You need to know the?nth?term formula?for a geometric progressiona?is the first term
    • r?is the common ratio

Exam 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.

4.5.1-Geom-Seq-Simult

Worked Example

4.5.1-Geom-Seq-Example

 

 

 

 

 

 

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