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Calculus II
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Telescoping Series
Worksheet
Grade Level
Calculus II
CAL2.115 Telescoping Series
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🔴 Hard
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Evaluate sum_{n=1}
infinity
(3n
2
+3n+1)/(n
3
(n+1)
3
).
A
The term equals 1/n
2
- 1/(n+1)
2
; the sum is 1/4.
B
The term equals 1/n
3
- 1/(n+1)
3
; the sum is 1.
C
The sum is 1/8 because cubes are involved.
D
The series diverges because the numerator is quadratic.
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