IGCSE /Grade 10
Maths MCQ Based On Working with geometric sequences
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IGCSE Grade 10 Maths Working with geometric sequences
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Use the formula S = a(1 - r^n)/(1 - r), where a is the first term (8), r is the common ratio (0.1), and n is the number of terms (7)
Tn = arn-1 (where a = first term and r = common ratio = Tn/Tn-1) is the nth term of a GP series.
Each time multiplying the preceding term by -0.5 to get the next term
an= arn-1
Use, Tn=arn -1
See how each term is obtained in relation with the preceding term
Common ratio = r = tn / tn-1
Common ratio = r = Tn/ Tn-1
The geometric sum formula for n terms: Sn=a(1−rn)/(1−r)
an = arn-1
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