Question

Answer 1

\(9.27\le3^n\le243\)

\(\Rightarrow3^5\le3^n\le3^5\)

\(\Rightarrow5\le n\le5\)

\(\Rightarrow n\in\left\{5\right\}\)

Answer 2

`@` `\text {Ans}`

`\downarrow`

`b)`

`9*27 \le 3^n \le 243`

`=> 3^2*3^3 \le 3^n \le 3^5`

`=> 3^5 \le 3^n \le 3^5`

`=> 5 \le n \le 5`

`=> n=5.`