Question

P lk z answer these questions.....

It's important.....

Correct answer will be marked as brainlist .....

Answer 1

According to given sum,

162,54,18........

a=162, r=54/162=1/3

2/81, 2/27, 2/9.......

b=2/81 , r=(2/27)/2/81=3

given that nth term are equal so

an=bn

$a {r}^{n - 1} = b {r}^{n - 1}$
$162 \times ({ \frac{1}{3} })^{n - 1} = \frac{2}{81} \times {3}^{n - 1}$
${3}^{8} = {3}^{2n - 2}$
8=2n-2

2n=10

n=5