Show, using an example, that the present value of an annuity is the difference between the present

Question:

Show, using an example, that the present value of an annuity is the difference between the present value of two perpetuities, one starting one year from today and the other starting N+1 years from today.

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,...