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Mathematics

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Quiz

Lesson 1 Quiz: Counting Principle, Permutations (nPr) and Combinations (nCr)

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  • Questions count: 2
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1.
The common ratio r of the geometric sequence (64, 32, 16, 8, ...) is:
r = -1/2
r = 2
r = 1/2
r = 4
2.
The sum to infinity (S_infinity) of a geometric series exists and converges if and only if the common ratio satisfies:
r > 1
|r| >= 2
|r| < 1 (i.e. -1 < r < 1), and S_infinity = a / (1 - r)
r = 1
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