If each term of a geometric progression a₁, a₂, a₃, … with a₁ = 1… | JEE Main 2024 Mathematics PYQ

MCQMediumJEE Main 2024 · 29 January, Shift 2Geometric Progression (GP)

If each term of a geometric progression $a_1, a_2, a_3, \ldots$ with $a_1 = \frac{1}{8}$ and $a_2 \ne a_1$ , is the arithmetic mean of the next two terms and $S_n = a_1 + a_2 + \ldots + a_n$ , then $S_{20} - S_{18}$ is equal to:

A
$2^{15}$
B
$-2^{18}$
C
$2^{18}$
D
$-2^{15}$

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