Let $\left[x\right]$ be the greatest integer less than or equal to $x$, for a real number $x$. Then the following sum

$\left[\frac{2^{2020}+1}{2^{2018}+1}\right]+\left[\frac{3^{2020}+1}{3^{2018}+1}\right]+\left[\frac{4^{2020}+1}{4^{2018}+1}\right]+\left[\frac{5^{2020}+1}{5^{2018}+1}\right]+\left[\frac{6^{2020}+1}{6^{2018}+1}\right]$

is :-

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