For an integer $n$, let $S_n=\left\{n+1,n+2,\dots ., n+18\right\}$. Which of the following is true for all $n\ge 10$ ?

Which among the following is not an irrational number?

How many numbers are there from $14$ to $159$ which are divisible by both $2$ and $8$?

Consider the following statements: For any integer $n,$ 

I.. $n^2+3$ is never divisible by $17$ .

II.. $n^2+4$ is never divisible by $17$. Then