Let $S_n$ denote the sum of the first $n$ terms of a geometric sequence $\{a_n\}$. $$S_4 - S_2 = 3a_4, \quad a_5 = \frac{3}{4}$$ Find the value of $a_1 + a_2$. [3 points] (1) 27 (2) 24 (3) 21 (4) 18 (5) 15
Let $S_n$ denote the sum of the first $n$ terms of a geometric sequence $\{a_n\}$.
$$S_4 - S_2 = 3a_4, \quad a_5 = \frac{3}{4}$$
Find the value of $a_1 + a_2$. [3 points]\\
(1) 27\\
(2) 24\\
(3) 21\\
(4) 18\\
(5) 15