[infinity]
Suppose an​>0 for all n and ∑ ​an​ converges, which of the following must converge?
ⁿ⁼¹
[infinity]
a. ∑ ​√an​​
ⁿ⁼¹
[infinity]
b. ∑ ​1/an​​
ⁿ⁼¹
c. no solution