Asked by Aria


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)!
Answered by oobleck
You have a problem with using a single name to post?

Use the ratio test
r = a_(n+1) / a_n
if r > 1 the terms are increasing
Answered by Aria
I got B or a_N = 3/n^3 is this right? Please check
Answered by oobleck
well, did you check your answer? The terms are
3/1, 3/8, 3/27, 3/64 ...
so, not B, I'd say.
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