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Quiz

Lesson 1 Questions: Arithmetic and Geometric Sequences and Series — Lesson quiz

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  • Questions count: 3
  • Passing grade: 60%
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1.
Which formula gives the n-th term of an arithmetic sequence with first term a and common difference d?
Tₙ = a + (n − 1) × d
Tₙ = a × rn−1
Tₙ = a + n × d
Tₙ = (n/2)(2a + d)
2.
The sum to infinity of a geometric series exists if and only if:
|r| is less than 1
|r| is greater than 1
r = 1
|r| ≥ 2
3.
If a, b, c are positive numbers in geometric sequence, then b equals:
(a + c)/2
ac
a2 + c2
√(ac)
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