Answer:
a1 = 1/2
r = 3/4
n = 5
Explanation:
The given geometric series is:

a1 represents the first term of the series. From the above series we can see that the first term is 1/2
r is the common ratio of a geometric series. It can be calculated by dividing any term of the geometric series with its previous terms. For the given series r will be:

n represents the number of terms in the series. From the above series we can count the number of terms to be 5.