Answer:
its b
Step-by-step explanation:
i did this
I'm guessing the sum is supposed to be

Split the summand into partial fractions:


If
, then

If
, then

This means

Consider the
th partial sum of the series:

The sum telescopes so that

and as
, the second term vanishes and leaves us with

BADEHGJK NM because it's going backwards and then it skips a letter
I think acute but I’m really not sure
Answer:
216
Step-by-step explanation: