What is the formula of general annuity?

The formula for the present value of a general annuity is given by:

[ PV = P \times \frac{1 - (1 + r)^{-n}}{r} ]

where ( PV ) is the present value of the annuity, ( P ) is the payment amount per period, ( r ) is the interest rate per period, and ( n ) is the total number of payments. For the future value of an annuity, the formula is:

[ FV = P \times \frac{(1 + r)^n - 1}{r} ]

where ( FV ) is the future value of the annuity.