Determine whether each series is convergent or divergent

1. (1/2) -(3/8) + (9/32)

2. 1+(3/1 x 2 x3)+ (5/1 x2 x 3 x 4 x 5)

3. (4pi/3)+ 5pi/6 + pi/3

The problem I am having on these is finding the general terms for the series so that I can use the comparison test. Any help would be appreciated as I have been trying to find the An term but these series throw me off.