Which amongst the following is the largest fraction?

Q. $\frac{4}{7}-\frac{5}{7^2}+\frac{4}{7^3}-\frac{5}{7^4}+\frac{4}{7^5}-\frac{5}{7^6}+....$ to infinity.

Q. Which amongst the following is the largest number?

Q. The height of 20 students of Coraldale School in inches is given below. Find the median height.
61, 65, 70, 62, 75, 72, 73, 60, 63, 64, 71, 72, 74, 75, 76, 72, 73, 72, 71, 70

Q. The multiplicative inverse of additive inverse of $\left(\frac{1}{5+2}\right)\left(\frac{7}{4}+7-\frac{35}{4}-\frac{7}{2}\right)$ is a/an
$\left(\frac{1}{5+2}\right)\left(\frac{7}{4}+7-\frac{35}{4}-\frac{7}{2}\right)$ के योज्य प्रतिलोम का गुणात्मक प्रतिलोम है/है

Q. Solve: $\left[{\left(\sqrt[6]{67}\right)}^2+{\left(\sqrt[6]{67}\right)}^{-2}\right]\left[{\left(\sqrt[6]{67}\right)}^4+{\left(\sqrt[6]{67}\right)}^{-4}\right]$