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Geometric Series Starter

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Write down the algebraic expression for a geometric series a + ar + ar 2 + ar 3 + … + ar n-1

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The 3 rd term of a geometric series is 75. The first term is 3, find r. r = 5

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The 4th term of a geometric series is 40. The first term is 5, find r. r = 2

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The 3rd term of a geometric series is 6. The first term is 24, find r. r = ½

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The 5th term of a geometric series is 8. The first term is, find r. r = 4

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The 3rd term of a geometric series is 48. If r=4, find the first term. a = 3

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The 6th term of a geometric series is -96. If r=2, find the first term. a = -3

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The 5th term of a geometric series is 48 and the 3 rd term is 12. Find the common ratio and the first term. r = 2 and a = 3

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The 6th term of a geometric series is 486 and the 3 rd term is 18. Find the common ratio and the first term. r = 3 and a = 2

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