Answer:
a = 2
Step-by-step explanation:
In geometric series, Sum of the series formula :
Sn = a[(rⁿ - 1)/(r - 1)]
We are given that Sn = 728 and
r = 3 and n =6
Thus,plugging in the relevant values;
728 = a[(3^(6) - 1)/(3 - 1)]
728 = 364a
a = 728/364
a = 2
