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Mathematics

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Unit 3

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Unit 4

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Unit 7

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Quiz

Lesson 1 Quiz: Arithmetic and Geometric Sequences and Series

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  • Questions count: 3
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1.
If a, b, c form an arithmetic sequence, then the arithmetic mean b equals:
b = sqrt(a * c)
b = 2 a c / (a + c)
b = a + c
b = (a + c) / 2
2.
If a, b, c form a geometric sequence of positive real numbers, the geometric mean b equals:
b = a * c
b = (a + c) / 2
b = + sqrt(a * c)
b = a2 + c2
3.
The sum of the first 10 terms of the geometric sequence 2, 6, 18, 54, ... equals:
118,096
29,524
59,048
19,682
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