=
Which of the following equations can be used
to find Sx, the value of an annuity after n
deposits.
O a. Sn=(a₁ (1-r))/(1-r)
O b. S_n=(a_1 (1-r^n))/r
O c. S_n=(a_1 (r^n))/(1-r)
O d. S_n=(a_1 (1-r^n))/(1+r)