1. ## rewrite summation

$\sum^4_{j=1} \frac {j}{j+1}$

The question is....rewrite this summation so the index variable is k and the starting value is 5

so. j = 1, k = 5....so j = k -4

So plugging these in I come up with:

$\sum^8_{k=5} \frac {k-4}{k+5}$

Is this correct?

2. if j = k - 4, then j + 1 = (k -4) + 1 = k-3, not k+5

3. Doh....I had it written down incorrectly. thanks