What circumstances favor the purchase of a pure annuity over an annuity twenty-years-certain? What circumstances favor an

Question:

What circumstances favor the purchase of a pure over an twenty-years-certain? What circumstances favor an twenty-years-certain over a pure Annuity
An annuity is a series of equal payment made at equal intervals during a period of time. In other words annuity is a contract between insurer and insurance company in which insurer make a lump-sum payment or a series of payment and, in return,...