Ineed with a homework assignment:

write each series in summation notation beginning with k = 1.

1/2 + 2/3 + 3/4 + 4/5 + 5/6

−11 + 12 − 13 + 14 − 15 + 16

9 − 16 + 25 − 36 + 49 − 64

3 + (3/2) + 1 + (3/4) + (3/5)

i get the numbers that go under and on top of the sigma, i need deriving the explicit value for the sequence that goes on the right of the sigma.