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Which of these sequences whose nth term is given below is increasing? (5 points)

A) a sub n = 1/n
B) a sub n = 3/n cubed
C) a sub n = n/n + 2
D) a sub n = 2^n/ (n plus 1)!

I got B. Please check!
4 years ago

Answers

Aria
Is this right?
4 years ago
oobleck
not B
Take a look at C.
The ratio a_n+1 / a_n is
(n+1)/(n+3) / (n/(n+2)
(n+1)/(n+3) * (n+2)/n
= (n^2+3n+2)/(n^2+3n)
> 1
so the terms are increasing. They converge to 1.
4 years ago

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