consider ∑ n=1
[infinity]
​
a n
​
. If ∑ n=1
[infinity]
​
∣a n
​
∣= 21
q2
​
, then (a.) the ∑ n=1
[infinity]
​
a n
​
diverges (b) the ∑ k=1
[infinity]
​
a n=1
[infinity]
​
is conditionally convergent (c) the ∑ k=1
[infinity]
​
a n
​
is conditionaliverge or may diverge - we cannot conclude d. the thanis absolutely canvergent e.) the ∑ n=1
[infinity]
​
a n
​
converges to 29
92
​