what is the term of office for a member of the senate

6 years

Explanation:

edg  They serve 6 year terms.  

But due to the rotation, every two years , 1/3 of the positions are up for re-election.

he would based it upon geographic luck which he often resulted his faith in.

the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.