New posts in Geometric Progressions

Showing that $a$, $b$, $c$, $d$ are in geometric progression iff $(a^2+b^2+c^2)(b^2+c^2+d^2)=(ab+bc+cd)^2$

Find $n$ if $\frac{9^{n+1}+4^{n+1}}{9^n+4^n} = 6$

Problem in a question concerning Geometric progression and quadratic equations

Is $1111111111111111111111111111111111111111111111111111111$ ($55$ $1$'s) a composite number?

Double summation with improper integral

The Arithmetic Mean (A.M) between two numbers exceeds their Geometric Mean (G.M.)

How to find the limit of series? (What should I know?)

Find closed formula by changing order of summation: $\sum_{i=1}^ni3^i$

Showing that numbers of the form 10101010...1 are composite

Is it more accurate to use the term Geometric Growth or Exponential Growth?