The value of ${a^{{{\log }_b}x}}$, where $a = 0.2,\;b = \sqrt 5 ,\;x = \frac{1}{4} + \frac{1}{8} + \frac{1}{{16}} + .........$to $\infty $ is
$1$
$2$
$\frac{1}{2}$
$4$
The first term of a $G.P.$ is $7$, the last term is $448$ and sum of all terms is $889$, then the common ratio is
The sum of $3$ numbers in geometric progression is $38$ and their product is $1728$. The middle number is
The sum of first three terms of a $G.P.$ is $\frac{13}{12}$ and their product is $-1$ Find the common ratio and the terms.
Find the sum to $n$ terms of the sequence, $8,88,888,8888 \ldots$
For what values of $x$, the numbers $\frac{2}{7}, x,-\frac{7}{2}$ are in $G.P.$?