Is the series geometric or telescoping what is the nth

Question

For each series:

a. Is the series geometric or telescoping?

b. What is the n^th partial sum s_n?

c. Is the series convergent or divergent? Why?

If convergent, find the sum.

- 3 + (6/5)+ (12/25) +(24/125) + (48/625) +...

- _n=1Σ^∞ 3/n(n+3)

- _n=1Σ^∞ ln(n/n+1)

- _n=1Σ^∞ 2^2n-1/3ⁿ⁺¹.