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A question on geometric sequences?
Hi, I am tutoring the UK curriculum for AS (11th grade) Level Mathematics and came upon this question which has stumped me. Any help would be appreciated.
An infinite geometric series has a first term a and sum to infinity b, where b ≠ 0. Prove that a lies between 0 and 2b. Now I can work out that the StI is b = a/(1 - r) but I’m not sure how to proceed from here. Any help would be most appreciated. Thanks. |
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