Would the number of politicians not have helped a number of poor people?

Would a number of poor people not have been helped by the number of politicians?

Would a number of poor people not has been helped by the number of politicians?

Would a number of poor people not have been help by the number of politicians?

Would a number of poor people not have helped by the number of politicians?

All of the above

Active Voice: Would have + third form of a verb

Passive Voice: Would have been + third form of a verb.