Question

The last term l of a geometric progression with n terms and a common ratio r is given by l=arn-1, where a is the first term. Given l, n and r, find a.

Answer 1

$\huge\bigstar\sf\red{Answer:}$

$\sf{In \ Geometric \ progression, }$

$\sf{First \ term=a,}$

$\sf{Common \ ratio=r,}$

$\sf{r=\dfrac{t_{n+1}}{t_{n}}}$

$\sf{Last \ term=ar^{n-1}}$